251764637249 has 2 divisors, whose sum is σ = 251764637250. Its totient is φ = 251764637248.

The previous prime is 251764637227. The next prime is 251764637273. The reversal of 251764637249 is 942736467152.

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., 223563480625 + 28201156624 = 472825^2 + 167932^2 .

It is a cyclic number.

It is not a de Polignac number, because 251764637249 - 2³⁶ = 183045160513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251764637194 and 251764637203.

It is not a weakly prime, because it can be changed into another prime (251764637749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125882318624 + 125882318625.

It is an arithmetic number, because the mean of its divisors is an integer number (125882318625).

Almost surely, 2^251764637249 is an apocalyptic number.

It is an amenable number.

251764637249 is a deficient number, since it is larger than the sum of its proper divisors (1).

251764637249 is an equidigital number, since it uses as much as digits as its factorization.

251764637249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15240960, while the sum is 56.

The spelling of 251764637249 in words is "two hundred fifty-one billion, seven hundred sixty-four million, six hundred thirty-seven thousand, two hundred forty-nine".