1263256945 has 32 divisors (see below), whose sum is σ = 1635427584. Its totient is φ = 934348800.

The previous prime is 1263256931. The next prime is 1263256957. The reversal of 1263256945 is 5496523621.

It is not a de Polignac number, because 1263256945 - 2¹¹ = 1263254897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 531610 + ... + 533980.

It is an arithmetic number, because the mean of its divisors is an integer number (51107112).

Almost surely, 2^1263256945 is an apocalyptic number.

It is an amenable number.

1263256945 is a deficient number, since it is larger than the sum of its proper divisors (372170639).

1263256945 is a wasteful number, since it uses less digits than its factorization.

1263256945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2553.

The product of its digits is 388800, while the sum is 43.

The square root of 1263256945 is about 35542.3261056448. The cubic root of 1263256945 is about 1081.0121241776.

The spelling of 1263256945 in words is "one billion, two hundred sixty-three million, two hundred fifty-six thousand, nine hundred forty-five".