81612150 has 48 divisors (see below), whose sum is σ = 208939008. Its totient is φ = 21060000.

The previous prime is 81612143. The next prime is 81612161. The reversal of 81612150 is 5121618.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81612150.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4126 + ... + 13425.

It is an arithmetic number, because the mean of its divisors is an integer number (4352896).

Almost surely, 2^81612150 is an apocalyptic number.

81612150 is an abundant number, since it is smaller than the sum of its proper divisors (127326858).

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

81612150 is a wasteful number, since it uses less digits than its factorization.

81612150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17597 (or 17592 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 81612150 is about 9033.9443212807. The cubic root of 81612150 is about 433.7621035471.

Adding to 81612150 its reverse (5121618), we get a palindrome (86733768).

The spelling of 81612150 in words is "eighty-one million, six hundred twelve thousand, one hundred fifty".