1256262457 has 2 divisors, whose sum is σ = 1256262458. Its totient is φ = 1256262456.

The previous prime is 1256262451. The next prime is 1256262479. The reversal of 1256262457 is 7542626521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 819619641 + 436642816 = 28629^2 + 20896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256262457 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256262451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628131228 + 628131229.

It is an arithmetic number, because the mean of its divisors is an integer number (628131229).

Almost surely, 2^1256262457 is an apocalyptic number.

It is an amenable number.

1256262457 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256262457 is an equidigital number, since it uses as much as digits as its factorization.

1256262457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 40.

The square root of 1256262457 is about 35443.7929262657. The cubic root of 1256262457 is about 1079.0132897537.

Adding to 1256262457 its reverse (7542626521), we get a palindrome (8798888978).

The spelling of 1256262457 in words is "one billion, two hundred fifty-six million, two hundred sixty-two thousand, four hundred fifty-seven".