81362515 has 24 divisors (see below), whose sum is σ = 107252640. Its totient is φ = 59215104.

The previous prime is 81362513. The next prime is 81362539. The reversal of 81362515 is 51526318.

It is not a de Polignac number, because 81362515 - 2¹ = 81362513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81362513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61026 + ... + 62344.

It is an arithmetic number, because the mean of its divisors is an integer number (4468860).

Almost surely, 2^81362515 is an apocalyptic number.

81362515 is a deficient number, since it is larger than the sum of its proper divisors (25890125).

81362515 is a wasteful number, since it uses less digits than its factorization.

81362515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1410 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 81362515 is about 9020.1172387059. The cubic root of 81362515 is about 433.3193884401.

The spelling of 81362515 in words is "eighty-one million, three hundred sixty-two thousand, five hundred fifteen".