81100402 has 16 divisors (see below), whose sum is σ = 126432000. Its totient is φ = 38974320.

The previous prime is 81100399. The next prime is 81100447. The reversal of 81100402 is 20400118.

It is a happy 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, 4849 + ... + 13627.

It is an arithmetic number, because the mean of its divisors is an integer number (7902000).

Almost surely, 2^81100402 is an apocalyptic number.

81100402 is a deficient number, since it is larger than the sum of its proper divisors (45331598).

81100402 is a wasteful number, since it uses less digits than its factorization.

81100402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8961.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 81100402 is about 9005.5761614680. The cubic root of 81100402 is about 432.8535685645.

The spelling of 81100402 in words is "eighty-one million, one hundred thousand, four hundred two".