51619657 has 2 divisors, whose sum is σ = 51619658. Its totient is φ = 51619656.

The previous prime is 51619649. The next prime is 51619661. The reversal of 51619657 is 75691615.

51619657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51609856 + 9801 = 7184^2 + 99^2 .

It is a cyclic number.

It is not a de Polignac number, because 51619657 - 2³ = 51619649 is a prime.

It is not a weakly prime, because it can be changed into another prime (51613657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25809828 + 25809829.

It is an arithmetic number, because the mean of its divisors is an integer number (25809829).

Almost surely, 2^51619657 is an apocalyptic number.

It is an amenable number.

51619657 is a deficient number, since it is larger than the sum of its proper divisors (1).

51619657 is an equidigital number, since it uses as much as digits as its factorization.

51619657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 40.

The square root of 51619657 is about 7184.6821084861. The cubic root of 51619657 is about 372.3388657908.

The spelling of 51619657 in words is "fifty-one million, six hundred nineteen thousand, six hundred fifty-seven".