1257520451 has 6 divisors (see below), whose sum is σ = 1382233356. Its totient is φ = 1143200300.

The previous prime is 1257520441. The next prime is 1257520463. The reversal of 1257520451 is 1540257521.

It is a de Polignac number, because none of the positive numbers 2^k-1257520451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1257520441) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5196245 + ... + 5196486.

It is an arithmetic number, because the mean of its divisors is an integer number (230372226).

Almost surely, 2^1257520451 is an apocalyptic number.

1257520451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1257520451 is a deficient number, since it is larger than the sum of its proper divisors (124712905).

1257520451 is a wasteful number, since it uses less digits than its factorization.

1257520451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10392753 (or 10392742 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

The square root of 1257520451 is about 35461.5348088601. The cubic root of 1257520451 is about 1079.3733364411.

Adding to 1257520451 its reverse (1540257521), we get a palindrome (2797777972).

The spelling of 1257520451 in words is "one billion, two hundred fifty-seven million, five hundred twenty thousand, four hundred fifty-one".