1251295481 has 2 divisors, whose sum is σ = 1251295482. Its totient is φ = 1251295480.

The previous prime is 1251295477. The next prime is 1251295517. The reversal of 1251295481 is 1845921521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 656179456 + 595116025 = 25616^2 + 24395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1251295481 - 2² = 1251295477 is a prime.

It is a super-2 number, since 2×1251295481² = 3131480761542042722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1251294481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 625647740 + 625647741.

It is an arithmetic number, because the mean of its divisors is an integer number (625647741).

Almost surely, 2^1251295481 is an apocalyptic number.

It is an amenable number.

1251295481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1251295481 is an equidigital number, since it uses as much as digits as its factorization.

1251295481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28800, while the sum is 38.

The square root of 1251295481 is about 35373.6551829183. The cubic root of 1251295481 is about 1077.5893537583.

The spelling of 1251295481 in words is "one billion, two hundred fifty-one million, two hundred ninety-five thousand, four hundred eighty-one".