81893150 has 12 divisors (see below), whose sum is σ = 152321352. Its totient is φ = 32757240.

The previous prime is 81893143. The next prime is 81893153. The reversal of 81893150 is 5139818.

It is a self number, because there is not a number n which added to its sum of digits gives 81893150.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81893153) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 818882 + ... + 818981.

It is an arithmetic number, because the mean of its divisors is an integer number (12693446).

Almost surely, 2^81893150 is an apocalyptic number.

81893150 is a deficient number, since it is larger than the sum of its proper divisors (70428202).

81893150 is a wasteful number, since it uses less digits than its factorization.

81893150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1637875 (or 1637870 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 81893150 is about 9049.4834106705. The cubic root of 81893150 is about 434.2593641779.

The spelling of 81893150 in words is "eighty-one million, eight hundred ninety-three thousand, one hundred fifty".