81450015231 has 16 divisors (see below), whose sum is σ = 120114785504. Its totient is φ = 48768407424.

The previous prime is 81450015181. The next prime is 81450015289. The reversal of 81450015231 is 13251005418.

It is not a de Polignac number, because 81450015231 - 2²⁵ = 81416460799 is a prime.

It is a super-2 number, since 2×81450015231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81450015331) 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, 28221016 + ... + 28223901.

It is an arithmetic number, because the mean of its divisors is an integer number (7507174094).

Almost surely, 2^81450015231 is an apocalyptic number.

81450015231 is a deficient number, since it is larger than the sum of its proper divisors (38664770273).

81450015231 is a wasteful number, since it uses less digits than its factorization.

81450015231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56444970.

The product of its (nonzero) digits is 4800, while the sum is 30.

The spelling of 81450015231 in words is "eighty-one billion, four hundred fifty million, fifteen thousand, two hundred thirty-one".