81365502 has 16 divisors (see below), whose sum is σ = 172303632. Its totient is φ = 25526400.

The previous prime is 81365477. The next prime is 81365527. The reversal of 81365502 is 20556318.

It is an interprime number because it is at equal distance from previous prime (81365477) and next prime (81365527).

It is a self number, because there is not a number n which added to its sum of digits gives 81365502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398749 + ... + 398952.

It is an arithmetic number, because the mean of its divisors is an integer number (10768977).

Almost surely, 2^81365502 is an apocalyptic number.

81365502 is an abundant number, since it is smaller than the sum of its proper divisors (90938130).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81365502 is a wasteful number, since it uses less digits than its factorization.

81365502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797723.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 81365502 is about 9020.2828115309. The cubic root of 81365502 is about 433.3246910834.

The spelling of 81365502 in words is "eighty-one million, three hundred sixty-five thousand, five hundred two".