51497687 has 2 divisors, whose sum is σ = 51497688. Its totient is φ = 51497686.

The previous prime is 51497683. The next prime is 51497701. The reversal of 51497687 is 78679415.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51497687 - 2² = 51497683 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 (51497683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25748843 + 25748844.

It is an arithmetic number, because the mean of its divisors is an integer number (25748844).

Almost surely, 2^51497687 is an apocalyptic number.

51497687 is a deficient number, since it is larger than the sum of its proper divisors (1).

51497687 is an equidigital number, since it uses as much as digits as its factorization.

51497687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 51497687 is about 7176.1888910479. The cubic root of 51497687 is about 372.0453730257.

The spelling of 51497687 in words is "fifty-one million, four hundred ninety-seven thousand, six hundred eighty-seven".