81512922 has 16 divisors (see below), whose sum is σ = 163196352. Its totient is φ = 27142560.

The previous prime is 81512917. The next prime is 81512927. The reversal of 81512922 is 22921518.

It is an interprime number because it is at equal distance from previous prime (81512917) and next prime (81512927).

It is a self number, because there is not a number n which added to its sum of digits gives 81512922.

It is not an unprimeable number, because it can be changed into a prime (81512927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 403 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (10199772).

Almost surely, 2^81512922 is an apocalyptic number.

81512922 is an abundant number, since it is smaller than the sum of its proper divisors (81683430).

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

81512922 is a wasteful number, since it uses less digits than its factorization.

81512922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14213.

The product of its digits is 2880, while the sum is 30.

The square root of 81512922 is about 9028.4506976557. The cubic root of 81512922 is about 433.5862359354.

It can be divided in two parts, 8 and 1512922, that added together give a triangular number (1512930 = T₁₇₃₉).

The spelling of 81512922 in words is "eighty-one million, five hundred twelve thousand, nine hundred twenty-two".