81055131 has 8 divisors (see below), whose sum is σ = 108333120. Its totient is φ = 53906952.

The previous prime is 81055127. The next prime is 81055141. The reversal of 81055131 is 13155018.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81055131 - 2² = 81055127 is a prime.

It is a super-2 number, since 2×81055131² = 13139868522854322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81055141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30985 + ... + 33498.

It is an arithmetic number, because the mean of its divisors is an integer number (13541640).

Almost surely, 2^81055131 is an apocalyptic number.

81055131 is a deficient number, since it is larger than the sum of its proper divisors (27277989).

81055131 is a wasteful number, since it uses less digits than its factorization.

81055131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64905.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 81055131 is about 9003.0623123468. The cubic root of 81055131 is about 432.7730126087.

The spelling of 81055131 in words is "eighty-one million, fifty-five thousand, one hundred thirty-one".