1257513945 has 16 divisors (see below), whose sum is σ = 2017049472. Its totient is φ = 668998400.

The previous prime is 1257513913. The next prime is 1257513967. The reversal of 1257513945 is 5493157521.

It is a happy number.

1257513945 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1257513945 - 2⁵ = 1257513913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1257513897 and 1257513906.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98517 + ... + 110546.

It is an arithmetic number, because the mean of its divisors is an integer number (126065592).

Almost surely, 2^1257513945 is an apocalyptic number.

1257513945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1257513945 is a deficient number, since it is larger than the sum of its proper divisors (759535527).

1257513945 is a wasteful number, since it uses less digits than its factorization.

1257513945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209472.

The product of its digits is 189000, while the sum is 42.

The square root of 1257513945 is about 35461.4430755433. The cubic root of 1257513945 is about 1079.3714749962.

The spelling of 1257513945 in words is "one billion, two hundred fifty-seven million, five hundred thirteen thousand, nine hundred forty-five".