81461151 has 12 divisors (see below), whose sum is σ = 123859320. Its totient is φ = 51449040.

The previous prime is 81461143. The next prime is 81461167. The reversal of 81461151 is 15116418.

It is not a de Polignac number, because 81461151 - 2³ = 81461143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81461141) 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, 238020 + ... + 238361.

It is an arithmetic number, because the mean of its divisors is an integer number (10321610).

Almost surely, 2^81461151 is an apocalyptic number.

81461151 is a deficient number, since it is larger than the sum of its proper divisors (42398169).

81461151 is a wasteful number, since it uses less digits than its factorization.

81461151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476406 (or 476403 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 81461151 is about 9025.5831390553. The cubic root of 81461151 is about 433.4944224886.

Adding to 81461151 its reverse (15116418), we get a palindrome (96577569).

The spelling of 81461151 in words is "eighty-one million, four hundred sixty-one thousand, one hundred fifty-one".