81151364 has 24 divisors (see below), whose sum is σ = 163981440. Its totient is φ = 34419456.

The previous prime is 81151361. The next prime is 81151403. The reversal of 81151364 is 46315118.

It is not an unprimeable number, because it can be changed into a prime (81151361) 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 7 ways as a sum of consecutive naturals, for example, 12224 + ... + 17655.

It is an arithmetic number, because the mean of its divisors is an integer number (6832560).

Almost surely, 2^81151364 is an apocalyptic number.

It is an amenable number.

81151364 is an abundant number, since it is smaller than the sum of its proper divisors (82830076).

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

81151364 is a wasteful number, since it uses less digits than its factorization.

81151364 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29987 (or 29985 counting only the distinct ones).

The product of its digits is 2880, while the sum is 29.

The square root of 81151364 is about 9008.4051862691. The cubic root of 81151364 is about 432.9442153189.

The spelling of 81151364 in words is "eighty-one million, one hundred fifty-one thousand, three hundred sixty-four".