3981294525 has 24 divisors (see below), whose sum is σ = 7088747680. Its totient is φ = 1960021440.

The previous prime is 3981294521. The next prime is 3981294553. The reversal of 3981294525 is 5254921893.

It is a happy number.

It is not a de Polignac number, because 3981294525 - 2² = 3981294521 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981294521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2040715 + ... + 2042664.

Almost surely, 2^3981294525 is an apocalyptic number.

It is an amenable number.

3981294525 is a deficient number, since it is larger than the sum of its proper divisors (3107453155).

3981294525 is a wasteful number, since it uses less digits than its factorization.

3981294525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4083405 (or 4083400 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 3981294525 is about 63097.5001485796. The cubic root of 3981294525 is about 1584.9227605851.

The spelling of 3981294525 in words is "three billion, nine hundred eighty-one million, two hundred ninety-four thousand, five hundred twenty-five".