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997271863 = 72101919973
BaseRepresentation
bin111011011100010…
…010100100110111
32120111112122210221
4323130102210313
54020300144423
6242542555211
733466446100
oct7334224467
92514478727
10997271863
11471a30125
12239b98b07
1312b7c34c3
149663b3a7
155c842e5d
hex3b712937

997271863 has 12 divisors (see below), whose sum is σ = 1161288360. Its totient is φ = 853922832.

The previous prime is 997271861. The next prime is 997271887. The reversal of 997271863 is 368172799.

It is not a de Polignac number, because 997271863 - 21 = 997271861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 997271863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997271861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39945 + ... + 59917.

It is an arithmetic number, because the mean of its divisors is an integer number (96774030).

Almost surely, 2997271863 is an apocalyptic number.

997271863 is the 19973-rd heptagonal number.

997271863 is a deficient number, since it is larger than the sum of its proper divisors (164016497).

997271863 is a wasteful number, since it uses less digits than its factorization.

997271863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21006 (or 20999 counting only the distinct ones).

The product of its digits is 1143072, while the sum is 52.

The square root of 997271863 is about 31579.6115080601. The cubic root of 997271863 is about 999.0897927742.

The spelling of 997271863 in words is "nine hundred ninety-seven million, two hundred seventy-one thousand, eight hundred sixty-three".

Divisors: 1 7 49 1019 7133 19973 49931 139811 978677 20352487 142467409 997271863