81411057 has 48 divisors (see below), whose sum is σ = 146240640. Its totient is φ = 42494976.

The previous prime is 81411047. The next prime is 81411089. The reversal of 81411057 is 75011418.

It is not a de Polignac number, because 81411057 - 2⁶ = 81410993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81411057.

It is not an unprimeable number, because it can be changed into a prime (81411037) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87169 + ... + 88097.

It is an arithmetic number, because the mean of its divisors is an integer number (3046680).

Almost surely, 2^81411057 is an apocalyptic number.

It is an amenable number.

81411057 is a deficient number, since it is larger than the sum of its proper divisors (64829583).

81411057 is a wasteful number, since it uses less digits than its factorization.

81411057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1059 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 81411057 is about 9022.8076007416. The cubic root of 81411057 is about 433.4055460851.

The spelling of 81411057 in words is "eighty-one million, four hundred eleven thousand, fifty-seven".