81151696 has 20 divisors (see below), whose sum is σ = 157428292. Its totient is φ = 40525056.

The previous prime is 81151667. The next prime is 81151709. The reversal of 81151696 is 69615118.

It can be written as a sum of positive squares in 2 ways, for example, as 9985600 + 71166096 = 3160^2 + 8436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12286 + ... + 17698.

Almost surely, 2^81151696 is an apocalyptic number.

It is an amenable number.

81151696 is a deficient number, since it is larger than the sum of its proper divisors (76276596).

81151696 is a wasteful number, since it uses less digits than its factorization.

81151696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6358 (or 6352 counting only the distinct ones).

The product of its digits is 12960, while the sum is 37.

The square root of 81151696 is about 9008.4236134853. The cubic root of 81151696 is about 432.9448057271.

The spelling of 81151696 in words is "eighty-one million, one hundred fifty-one thousand, six hundred ninety-six".