81167625 has 96 divisors (see below), whose sum is σ = 182617344. Its totient is φ = 33696000.

The previous prime is 81167623. The next prime is 81167629. The reversal of 81167625 is 52676118.

It is not a de Polignac number, because 81167625 - 2¹ = 81167623 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 81167625.

It is not an unprimeable number, because it can be changed into a prime (81167623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 86157 + ... + 87093.

It is an arithmetic number, because the mean of its divisors is an integer number (1902264).

Almost surely, 2^81167625 is an apocalyptic number.

It is an amenable number.

81167625 is an abundant number, since it is smaller than the sum of its proper divisors (101449719).

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

81167625 is a wasteful number, since it uses less digits than its factorization.

81167625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976 (or 963 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 81167625 is about 9009.3076870534. The cubic root of 81167625 is about 432.9731309787.

The spelling of 81167625 in words is "eighty-one million, one hundred sixty-seven thousand, six hundred twenty-five".