81151698 has 32 divisors (see below), whose sum is σ = 171786240. Its totient is φ = 25485840.

The previous prime is 81151667. The next prime is 81151709. The reversal of 81151698 is 89615118.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19911 + ... + 23637.

It is an arithmetic number, because the mean of its divisors is an integer number (5368320).

Almost surely, 2^81151698 is an apocalyptic number.

81151698 is an abundant number, since it is smaller than the sum of its proper divisors (90634542).

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

81151698 is a wasteful number, since it uses less digits than its factorization.

81151698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3942.

The product of its digits is 17280, while the sum is 39.

The square root of 81151698 is about 9008.4237244925. The cubic root of 81151698 is about 432.9448092837.

The spelling of 81151698 in words is "eighty-one million, one hundred fifty-one thousand, six hundred ninety-eight".