3125921381 has 16 divisors (see below), whose sum is σ = 3489695808. Its totient is φ = 2799252720.

The previous prime is 3125921341. The next prime is 3125921411. The reversal of 3125921381 is 1831295213.

3125921381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3125921381 - 2²⁶ = 3058812517 is a prime.

It is a super-2 number, since 2×3125921381² = 19542768960385894322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3125921341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71651 + ... + 106703.

It is an arithmetic number, because the mean of its divisors is an integer number (218105988).

Almost surely, 2^3125921381 is an apocalyptic number.

It is an amenable number.

3125921381 is a deficient number, since it is larger than the sum of its proper divisors (363774427).

3125921381 is an equidigital number, since it uses as much as digits as its factorization.

3125921381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35153 (or 35131 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 3125921381 is about 55909.9399123269. The cubic root of 3125921381 is about 1462.1525421544.

The spelling of 3125921381 in words is "three billion, one hundred twenty-five million, nine hundred twenty-one thousand, three hundred eighty-one".