51502251949 has 2 divisors, whose sum is σ = 51502251950. Its totient is φ = 51502251948.

The previous prime is 51502251943. The next prime is 51502251991. The reversal of 51502251949 is 94915220515.

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., 45708302025 + 5793949924 = 213795^2 + 76118^2 .

It is a cyclic number.

It is not a de Polignac number, because 51502251949 - 2⁵ = 51502251917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51502251943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25751125974 + 25751125975.

It is an arithmetic number, because the mean of its divisors is an integer number (25751125975).

Almost surely, 2^51502251949 is an apocalyptic number.

It is an amenable number.

51502251949 is a deficient number, since it is larger than the sum of its proper divisors (1).

51502251949 is an equidigital number, since it uses as much as digits as its factorization.

51502251949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 51502251949 in words is "fifty-one billion, five hundred two million, two hundred fifty-one thousand, nine hundred forty-nine".