81157502 has 16 divisors (see below), whose sum is σ = 126900240. Its totient is φ = 38890368.

The previous prime is 81157487. The next prime is 81157523. The reversal of 81157502 is 20575118.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3227 + ... + 13142.

It is an arithmetic number, because the mean of its divisors is an integer number (7931265).

Almost surely, 2^81157502 is an apocalyptic number.

81157502 is a deficient number, since it is larger than the sum of its proper divisors (45742738).

81157502 is a wasteful number, since it uses less digits than its factorization.

81157502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16475.

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 81157502 is about 9008.7458616613. The cubic root of 81157502 is about 432.9551304963.

The spelling of 81157502 in words is "eighty-one million, one hundred fifty-seven thousand, five hundred two".