81151695 has 12 divisors (see below), whose sum is σ = 140663016. Its totient is φ = 43280880.

The previous prime is 81151667. The next prime is 81151709. The reversal of 81151695 is 59615118.

It is not a de Polignac number, because 81151695 - 2⁵ = 81151663 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 901641 + ... + 901730.

It is an arithmetic number, because the mean of its divisors is an integer number (11721918).

Almost surely, 2^81151695 is an apocalyptic number.

81151695 is a deficient number, since it is larger than the sum of its proper divisors (59511321).

81151695 is a wasteful number, since it uses less digits than its factorization.

81151695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803382 (or 1803379 counting only the distinct ones).

The product of its digits is 10800, while the sum is 36.

The square root of 81151695 is about 9008.4235579817. The cubic root of 81151695 is about 432.9448039487.

The spelling of 81151695 in words is "eighty-one million, one hundred fifty-one thousand, six hundred ninety-five".