51065091 has 48 divisors (see below), whose sum is σ = 94967808. Its totient is φ = 25660800.

The previous prime is 51065087. The next prime is 51065111. The reversal of 51065091 is 19056015.

51065091 is a `hidden beast` number, since 5 + 1 + 0 + 650 + 9 + 1 = 666.

It is not a de Polignac number, because 51065091 - 2² = 51065087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51065041) 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, 20295 + ... + 22671.

It is an arithmetic number, because the mean of its divisors is an integer number (1978496).

Almost surely, 2^51065091 is an apocalyptic number.

51065091 is a deficient number, since it is larger than the sum of its proper divisors (43902717).

51065091 is a wasteful number, since it uses less digits than its factorization.

51065091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432 (or 2429 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 27.

The square root of 51065091 is about 7145.9842569096. The cubic root of 51065091 is about 371.0006780913. Note that the first 3 decimals are identical.

The spelling of 51065091 in words is "fifty-one million, sixty-five thousand, ninety-one".