51679657 has 2 divisors, whose sum is σ = 51679658. Its totient is φ = 51679656.

The previous prime is 51679651. The next prime is 51679669. The reversal of 51679657 is 75697615.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51566761 + 112896 = 7181^2 + 336^2 .

It is a cyclic number.

It is not a de Polignac number, because 51679657 - 2²³ = 43291049 is a prime.

It is not a weakly prime, because it can be changed into another prime (51679651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25839828 + 25839829.

It is an arithmetic number, because the mean of its divisors is an integer number (25839829).

Almost surely, 2^51679657 is an apocalyptic number.

It is an amenable number.

51679657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51679657 is an equidigital number, since it uses as much as digits as its factorization.

51679657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 396900, while the sum is 46.

The square root of 51679657 is about 7188.8564459168. The cubic root of 51679657 is about 372.4830723656.

The spelling of 51679657 in words is "fifty-one million, six hundred seventy-nine thousand, six hundred fifty-seven".