51187679 has 2 divisors, whose sum is σ = 51187680. Its totient is φ = 51187678.

The previous prime is 51187657. The next prime is 51187681. The reversal of 51187679 is 97678115.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51187679 is a prime.

It is a Sophie Germain prime.

Together with 51187681, 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 (51187649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25593839 + 25593840.

It is an arithmetic number, because the mean of its divisors is an integer number (25593840).

Almost surely, 2^51187679 is an apocalyptic number.

51187679 is a deficient number, since it is larger than the sum of its proper divisors (1).

51187679 is an equidigital number, since it uses as much as digits as its factorization.

51187679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 51187679 is about 7154.5565201485. The cubic root of 51187679 is about 371.2973183536.

It can be divided in two parts, 5 and 1187679, that multiplied together give a palindrome (5938395).

The spelling of 51187679 in words is "fifty-one million, one hundred eighty-seven thousand, six hundred seventy-nine".