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80919 = 3737
BaseRepresentation
bin10011110000010111
311010000000
4103300113
510042134
61422343
7454626
oct236027
9133000
1080919
1155883
123a9b3
132aaa7
14216bd
1518e99
hex13c17

80919 has 16 divisors (see below), whose sum is σ = 124640. Its totient is φ = 52488.

The previous prime is 80917. The next prime is 80923. The reversal of 80919 is 91908.

It can be divided in two parts, 8091 and 9, that added together give a square (8100 = 902).

It is not a de Polignac number, because 80919 - 21 = 80917 is a prime.

It is a super-2 number, since 2×809192 = 13095769122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80892 and 80901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2169 + ... + 2205.

It is an arithmetic number, because the mean of its divisors is an integer number (7790).

280919 is an apocalyptic number.

80919 is a deficient number, since it is larger than the sum of its proper divisors (43721).

80919 is an frugal number, since it uses more digits than its factorization.

80919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 40 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 80919 is about 284.4626513270. The cubic root of 80919 is about 43.2530598033.

The spelling of 80919 in words is "eighty thousand, nine hundred nineteen".

Divisors: 1 3 9 27 37 81 111 243 333 729 999 2187 2997 8991 26973 80919