81492051 has 8 divisors (see below), whose sum is σ = 111306384. Its totient is φ = 53002880.

The previous prime is 81492043. The next prime is 81492053. The reversal of 81492051 is 15029418.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 81492051 - 2³ = 81492043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81492053) 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, 331146 + ... + 331391.

It is an arithmetic number, because the mean of its divisors is an integer number (13913298).

Almost surely, 2^81492051 is an apocalyptic number.

81492051 is a deficient number, since it is larger than the sum of its proper divisors (29814333).

81492051 is a wasteful number, since it uses less digits than its factorization.

81492051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 662581.

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 81492051 is about 9027.2947775067. The cubic root of 81492051 is about 433.5492268716.

The spelling of 81492051 in words is "eighty-one million, four hundred ninety-two thousand, fifty-one".