51695091 has 24 divisors (see below), whose sum is σ = 88501504. Its totient is φ = 29539080.

The previous prime is 51695071. The next prime is 51695093. The reversal of 51695091 is 19059615.

51695091 is a `hidden beast` number, since 516 + 9 + 50 + 91 = 666.

It is not a de Polignac number, because 51695091 - 2¹⁰ = 51694067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51695093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13495 + ... + 16896.

Almost surely, 2^51695091 is an apocalyptic number.

51695091 is a deficient number, since it is larger than the sum of its proper divisors (36806413).

51695091 is an equidigital number, since it uses as much as digits as its factorization.

51695091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30413 (or 30401 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 36.

The square root of 51695091 is about 7189.9298327591. The cubic root of 51695091 is about 372.5201490535.

The spelling of 51695091 in words is "fifty-one million, six hundred ninety-five thousand, ninety-one".