1256537923 has 2 divisors, whose sum is σ = 1256537924. Its totient is φ = 1256537922.

The previous prime is 1256537921. The next prime is 1256537999. The reversal of 1256537923 is 3297356521.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1256537923 - 2¹ = 1256537921 is a prime.

Together with 1256537921, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1256537923.

It is not a weakly prime, because it can be changed into another prime (1256537921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628268961 + 628268962.

It is an arithmetic number, because the mean of its divisors is an integer number (628268962).

Almost surely, 2^1256537923 is an apocalyptic number.

1256537923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256537923 is an equidigital number, since it uses as much as digits as its factorization.

1256537923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 340200, while the sum is 43.

The square root of 1256537923 is about 35447.6786687083. The cubic root of 1256537923 is about 1079.0921505975.

The spelling of 1256537923 in words is "one billion, two hundred fifty-six million, five hundred thirty-seven thousand, nine hundred twenty-three".