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997864921 = 31210192
BaseRepresentation
bin111011011110100…
…011010111011001
32120112122210100001
4323132203113121
54020423134141
6243003413001
733504466114
oct7336432731
92515583301
10997864921
114722a5759
1223a224161
1312b970421
149675357b
155c90da31
hex3b7a35d9

997864921 has 9 divisors (see below), whose sum is σ = 1032105333. Its totient is φ = 964728060.

The previous prime is 997864909. The next prime is 997864937. The reversal of 997864921 is 129468799.

The square root of 997864921 is 31589.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 997864921 - 227 = 863647193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997864961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 978750 + ... + 979768.

Almost surely, 2997864921 is an apocalyptic number.

997864921 is the 31589-th square number.

997864921 is the 15795-th centered octagonal number.

It is an amenable number.

997864921 is a deficient number, since it is larger than the sum of its proper divisors (34240412).

997864921 is an frugal number, since it uses more digits than its factorization.

997864921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100 (or 1050 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 55.

The cubic root of 997864921 is about 999.2877998914.

The spelling of 997864921 in words is "nine hundred ninety-seven million, eight hundred sixty-four thousand, nine hundred twenty-one".

Divisors: 1 31 961 1019 31589 979259 1038361 32189191 997864921