1256190797 has 2 divisors, whose sum is σ = 1256190798. Its totient is φ = 1256190796.

The previous prime is 1256190787. The next prime is 1256190823. The reversal of 1256190797 is 7970916521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 883932361 + 372258436 = 29731^2 + 19294^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256190797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256190787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628095398 + 628095399.

It is an arithmetic number, because the mean of its divisors is an integer number (628095399).

Almost surely, 2^1256190797 is an apocalyptic number.

It is an amenable number.

1256190797 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256190797 is an equidigital number, since it uses as much as digits as its factorization.

1256190797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 238140, while the sum is 47.

The square root of 1256190797 is about 35442.7820155247. The cubic root of 1256190797 is about 1078.9927729256.

The spelling of 1256190797 in words is "one billion, two hundred fifty-six million, one hundred ninety thousand, seven hundred ninety-seven".