51697895 has 16 divisors (see below), whose sum is σ = 62916960. Its totient is φ = 40777344.

The previous prime is 51697883. The next prime is 51697903. The reversal of 51697895 is 59879615.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 51697895 - 2⁶ = 51697831 is a prime.

It is a congruent number.

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, 186497 + ... + 186773.

It is an arithmetic number, because the mean of its divisors is an integer number (3932310).

Almost surely, 2^51697895 is an apocalyptic number.

51697895 is a deficient number, since it is larger than the sum of its proper divisors (11219065).

51697895 is a wasteful number, since it uses less digits than its factorization.

51697895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674.

The product of its digits is 680400, while the sum is 50.

The square root of 51697895 is about 7190.1248250639. The cubic root of 51697895 is about 372.5268842360.

The spelling of 51697895 in words is "fifty-one million, six hundred ninety-seven thousand, eight hundred ninety-five".