3125815481 has 2 divisors, whose sum is σ = 3125815482. Its totient is φ = 3125815480.

The previous prime is 3125815477. The next prime is 3125815487. The reversal of 3125815481 is 1845185213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2715347881 + 410467600 = 52109^2 + 20260^2 .

It is a cyclic number.

It is not a de Polignac number, because 3125815481 - 2² = 3125815477 is a prime.

It is a super-2 number, since 2×3125815481² = 19541444842518522722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3125815487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1562907740 + 1562907741.

It is an arithmetic number, because the mean of its divisors is an integer number (1562907741).

Almost surely, 2^3125815481 is an apocalyptic number.

It is an amenable number.

3125815481 is a deficient number, since it is larger than the sum of its proper divisors (1).

3125815481 is an equidigital number, since it uses as much as digits as its factorization.

3125815481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38400, while the sum is 38.

The square root of 3125815481 is about 55908.9928455164. The cubic root of 3125815481 is about 1462.1360303612.

The spelling of 3125815481 in words is "three billion, one hundred twenty-five million, eight hundred fifteen thousand, four hundred eighty-one".