81151365 has 16 divisors (see below), whose sum is σ = 130419648. Its totient is φ = 43088256.

The previous prime is 81151361. The next prime is 81151403. The reversal of 81151365 is 56315118.

It is not a de Polignac number, because 81151365 - 2² = 81151361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81151361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8512 + ... + 15321.

It is an arithmetic number, because the mean of its divisors is an integer number (8151228).

Almost surely, 2^81151365 is an apocalyptic number.

It is an amenable number.

81151365 is a deficient number, since it is larger than the sum of its proper divisors (49268283).

81151365 is a wasteful number, since it uses less digits than its factorization.

81151365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24068.

The product of its digits is 3600, while the sum is 30.

The square root of 81151365 is about 9008.4052417728. The cubic root of 81151365 is about 432.9442170972.

The spelling of 81151365 in words is "eighty-one million, one hundred fifty-one thousand, three hundred sixty-five".