1252640261 has 2 divisors, whose sum is σ = 1252640262. Its totient is φ = 1252640260.

The previous prime is 1252640161. The next prime is 1252640273. The reversal of 1252640261 is 1620462521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 949009636 + 303630625 = 30806^2 + 17425^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1252640261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1252640161) 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, 626320130 + 626320131.

It is an arithmetic number, because the mean of its divisors is an integer number (626320131).

Almost surely, 2^1252640261 is an apocalyptic number.

It is an amenable number.

1252640261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252640261 is an equidigital number, since it uses as much as digits as its factorization.

1252640261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 1252640261 is about 35392.6582923634. The cubic root of 1252640261 is about 1077.9752476352.

The spelling of 1252640261 in words is "one billion, two hundred fifty-two million, six hundred forty thousand, two hundred sixty-one".