81893151 has 12 divisors (see below), whose sum is σ = 118396512. Its totient is φ = 54546336.

The previous prime is 81893143. The next prime is 81893153. The reversal of 81893151 is 15139818.

It is not a de Polignac number, because 81893151 - 2³ = 81893143 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 8515 + ... + 15371.

It is an arithmetic number, because the mean of its divisors is an integer number (9866376).

Almost surely, 2^81893151 is an apocalyptic number.

81893151 is a deficient number, since it is larger than the sum of its proper divisors (36503361).

81893151 is a wasteful number, since it uses less digits than its factorization.

81893151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190 (or 8187 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 81893151 is about 9049.4834659222. The cubic root of 81893151 is about 434.2593659455.

The spelling of 81893151 in words is "eighty-one million, eight hundred ninety-three thousand, one hundred fifty-one".