51398687 has 2 divisors, whose sum is σ = 51398688. Its totient is φ = 51398686.

The previous prime is 51398609. The next prime is 51398689. The reversal of 51398687 is 78689315.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51398687 - 2²⁴ = 34621471 is a prime.

Together with 51398689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51398689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699343 + 25699344.

It is an arithmetic number, because the mean of its divisors is an integer number (25699344).

Almost surely, 2^51398687 is an apocalyptic number.

51398687 is a deficient number, since it is larger than the sum of its proper divisors (1).

51398687 is an equidigital number, since it uses as much as digits as its factorization.

51398687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 51398687 is about 7169.2877609983. The cubic root of 51398687 is about 371.8068113752.

The spelling of 51398687 in words is "fifty-one million, three hundred ninety-eight thousand, six hundred eighty-seven".