51939287 has 2 divisors, whose sum is σ = 51939288. Its totient is φ = 51939286.

The previous prime is 51939259. The next prime is 51939299. The reversal of 51939287 is 78293915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51939287 - 2¹⁴ = 51922903 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51939187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25969643 + 25969644.

It is an arithmetic number, because the mean of its divisors is an integer number (25969644).

Almost surely, 2^51939287 is an apocalyptic number.

51939287 is a deficient number, since it is larger than the sum of its proper divisors (1).

51939287 is an equidigital number, since it uses as much as digits as its factorization.

51939287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 44.

The square root of 51939287 is about 7206.8916323197. The cubic root of 51939287 is about 373.1057950399.

The spelling of 51939287 in words is "fifty-one million, nine hundred thirty-nine thousand, two hundred eighty-seven".