81412522 has 4 divisors (see below), whose sum is σ = 122118786. Its totient is φ = 40706260.

The previous prime is 81412519. The next prime is 81412523. The reversal of 81412522 is 22521418.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 62394201 + 19018321 = 7899^2 + 4361^2 .

It is not an unprimeable number, because it can be changed into a prime (81412523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20353129 + ... + 20353132.

Almost surely, 2^81412522 is an apocalyptic number.

81412522 is a deficient number, since it is larger than the sum of its proper divisors (40706264).

81412522 is a wasteful number, since it uses less digits than its factorization.

81412522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40706263.

The product of its digits is 1280, while the sum is 25.

The square root of 81412522 is about 9022.8887835327. Note that the first 3 decimals coincide. The cubic root of 81412522 is about 433.4081457947.

The spelling of 81412522 in words is "eighty-one million, four hundred twelve thousand, five hundred twenty-two".