1256151293 has 2 divisors, whose sum is σ = 1256151294. Its totient is φ = 1256151292.

The previous prime is 1256151287. The next prime is 1256151311. The reversal of 1256151293 is 3921516521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176352804 + 79798489 = 34298^2 + 8933^2 .

It is a cyclic number.

It is not a de Polignac number, because 1256151293 - 2⁴ = 1256151277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256151263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628075646 + 628075647.

It is an arithmetic number, because the mean of its divisors is an integer number (628075647).

Almost surely, 2^1256151293 is an apocalyptic number.

It is an amenable number.

1256151293 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256151293 is an equidigital number, since it uses as much as digits as its factorization.

1256151293 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 35.

The square root of 1256151293 is about 35442.2247185472. The cubic root of 1256151293 is about 1078.9814622825.

The spelling of 1256151293 in words is "one billion, two hundred fifty-six million, one hundred fifty-one thousand, two hundred ninety-three".