51977287 has 2 divisors, whose sum is σ = 51977288. Its totient is φ = 51977286.

The previous prime is 51977273. The next prime is 51977291. The reversal of 51977287 is 78277915.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51977287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51977207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25988643 + 25988644.

It is an arithmetic number, because the mean of its divisors is an integer number (25988644).

Almost surely, 2^51977287 is an apocalyptic number.

51977287 is a deficient number, since it is larger than the sum of its proper divisors (1).

51977287 is an equidigital number, since it uses as much as digits as its factorization.

51977287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 246960, while the sum is 46.

The square root of 51977287 is about 7209.5275157253. The cubic root of 51977287 is about 373.1967638407.

The spelling of 51977287 in words is "fifty-one million, nine hundred seventy-seven thousand, two hundred eighty-seven".