51465649 has 2 divisors, whose sum is σ = 51465650. Its totient is φ = 51465648.

The previous prime is 51465599. The next prime is 51465677. The reversal of 51465649 is 94656415.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 15944049 = 5960^2 + 3993^2 .

It is a cyclic number.

It is not a de Polignac number, because 51465649 - 2⁷ = 51465521 is a prime.

It is not a weakly prime, because it can be changed into another prime (51465679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25732824 + 25732825.

It is an arithmetic number, because the mean of its divisors is an integer number (25732825).

Almost surely, 2^51465649 is an apocalyptic number.

It is an amenable number.

51465649 is a deficient number, since it is larger than the sum of its proper divisors (1).

51465649 is an equidigital number, since it uses as much as digits as its factorization.

51465649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129600, while the sum is 40.

The square root of 51465649 is about 7173.9563003966. The cubic root of 51465649 is about 371.9682041078.

The spelling of 51465649 in words is "fifty-one million, four hundred sixty-five thousand, six hundred forty-nine".