51136487 has 2 divisors, whose sum is σ = 51136488. Its totient is φ = 51136486.

The previous prime is 51136457. The next prime is 51136507. The reversal of 51136487 is 78463115.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51136487 - 2⁸ = 51136231 is a prime.

It is a super-2 number, since 2×51136487² = 5229880605402338, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51136447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25568243 + 25568244.

It is an arithmetic number, because the mean of its divisors is an integer number (25568244).

Almost surely, 2^51136487 is an apocalyptic number.

51136487 is a deficient number, since it is larger than the sum of its proper divisors (1).

51136487 is an equidigital number, since it uses as much as digits as its factorization.

51136487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20160, while the sum is 35.

The square root of 51136487 is about 7150.9780449950. The cubic root of 51136487 is about 371.1735008480.

The spelling of 51136487 in words is "fifty-one million, one hundred thirty-six thousand, four hundred eighty-seven".