81055130 has 32 divisors (see below), whose sum is σ = 157601808. Its totient is φ = 29836800.

The previous prime is 81055127. The next prime is 81055141. The reversal of 81055130 is 3155018.

It can be written as a sum of positive squares in 8 ways, for example, as 1256641 + 79798489 = 1121^2 + 8933^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81055096 and 81055105.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53990 + ... + 55470.

Almost surely, 2^81055130 is an apocalyptic number.

81055130 is a deficient number, since it is larger than the sum of its proper divisors (76546678).

81055130 is a wasteful number, since it uses less digits than its factorization.

81055130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922.

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 81055130 is about 9003.0622568102. The cubic root of 81055130 is about 432.7730108289.

The spelling of 81055130 in words is "eighty-one million, fifty-five thousand, one hundred thirty".