51695971 has 2 divisors, whose sum is σ = 51695972. Its totient is φ = 51695970.

The previous prime is 51695887. The next prime is 51695981. The reversal of 51695971 is 17959615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51695971 - 2⁹ = 51695459 is a prime.

It is not a weakly prime, because it can be changed into another prime (51695981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25847985 + 25847986.

It is an arithmetic number, because the mean of its divisors is an integer number (25847986).

Almost surely, 2^51695971 is an apocalyptic number.

51695971 is a deficient number, since it is larger than the sum of its proper divisors (1).

51695971 is an equidigital number, since it uses as much as digits as its factorization.

51695971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85050, while the sum is 43.

The square root of 51695971 is about 7189.9910292016. The cubic root of 51695971 is about 372.5222628317.

The spelling of 51695971 in words is "fifty-one million, six hundred ninety-five thousand, nine hundred seventy-one".