1256340097 has 4 divisors (see below), whose sum is σ = 1322463280. Its totient is φ = 1190216916.

The previous prime is 1256340049. The next prime is 1256340119. The reversal of 1256340097 is 7900436521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1256340097 - 2¹⁵ = 1256307329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1256340497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33061563 + ... + 33061600.

It is an arithmetic number, because the mean of its divisors is an integer number (330615820).

Almost surely, 2^1256340097 is an apocalyptic number.

It is an amenable number.

1256340097 is a deficient number, since it is larger than the sum of its proper divisors (66123183).

1256340097 is an equidigital number, since it uses as much as digits as its factorization.

1256340097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66123182.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 1256340097 is about 35444.8881645859. Note that the first 3 decimals coincide. The cubic root of 1256340097 is about 1079.0355178227.

The spelling of 1256340097 in words is "one billion, two hundred fifty-six million, three hundred forty thousand, ninety-seven".