81369150 has 24 divisors (see below), whose sum is σ = 201795864. Its totient is φ = 21698400.

The previous prime is 81369149. The next prime is 81369161. The reversal of 81369150 is 5196318.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 271081 + ... + 271380.

It is an arithmetic number, because the mean of its divisors is an integer number (8408161).

Almost surely, 2^81369150 is an apocalyptic number.

81369150 is an abundant number, since it is smaller than the sum of its proper divisors (120426714).

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

81369150 is a wasteful number, since it uses less digits than its factorization.

81369150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542476 (or 542471 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 81369150 is about 9020.4850202193. The cubic root of 81369150 is about 433.3311669846.

The spelling of 81369150 in words is "eighty-one million, three hundred sixty-nine thousand, one hundred fifty".