1256262521 has 2 divisors, whose sum is σ = 1256262522. Its totient is φ = 1256262520.

The previous prime is 1256262493. The next prime is 1256262533. The reversal of 1256262521 is 1252626521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1173816121 + 82446400 = 34261^2 + 9080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256262521 - 2⁶ = 1256262457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256262541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628131260 + 628131261.

It is an arithmetic number, because the mean of its divisors is an integer number (628131261).

Almost surely, 2^1256262521 is an apocalyptic number.

It is an amenable number.

1256262521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256262521 is an equidigital number, since it uses as much as digits as its factorization.

1256262521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 32.

The square root of 1256262521 is about 35443.7938291036. The cubic root of 1256262521 is about 1079.0133080770.

The spelling of 1256262521 in words is "one billion, two hundred fifty-six million, two hundred sixty-two thousand, five hundred twenty-one".