81151802 has 32 divisors (see below), whose sum is σ = 129600000. Its totient is φ = 38054016.

The previous prime is 81151781. The next prime is 81151817. The reversal of 81151802 is 20815118.

It is a super-2 number, since 2×81151802² = 13171229935694408, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407699 + ... + 407897.

It is an arithmetic number, because the mean of its divisors is an integer number (4050000).

Almost surely, 2^81151802 is an apocalyptic number.

81151802 is a deficient number, since it is larger than the sum of its proper divisors (48448198).

81151802 is a wasteful number, since it uses less digits than its factorization.

81151802 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 640, while the sum is 26.

The square root of 81151802 is about 9008.4294968657. The cubic root of 81151802 is about 432.9449942305.

The spelling of 81151802 in words is "eighty-one million, one hundred fifty-one thousand, eight hundred two".