1256425945 has 16 divisors (see below), whose sum is σ = 1599937920. Its totient is φ = 945138304.

The previous prime is 1256425943. The next prime is 1256426047. The reversal of 1256425945 is 5495246521.

It is a cyclic number.

It is not a de Polignac number, because 1256425945 - 2¹ = 1256425943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1256425943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85804 + ... + 99373.

It is an arithmetic number, because the mean of its divisors is an integer number (99996120).

Almost surely, 2^1256425945 is an apocalyptic number.

It is an amenable number.

1256425945 is a deficient number, since it is larger than the sum of its proper divisors (343511975).

1256425945 is a wasteful number, since it uses less digits than its factorization.

1256425945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185264.

The product of its digits is 432000, while the sum is 43.

The square root of 1256425945 is about 35446.0991506823. The cubic root of 1256425945 is about 1079.0600947484.

The spelling of 1256425945 in words is "one billion, two hundred fifty-six million, four hundred twenty-five thousand, nine hundred forty-five".