3988161531 has 6 divisors (see below), whose sum is σ = 5760677780. Its totient is φ = 2658774348.

The previous prime is 3988161493. The next prime is 3988161539. The reversal of 3988161531 is 1351618893.

It is a happy number.

3988161531 is a `hidden beast` number, since 39 + 8 + 81 + 6 + 1 + 531 = 666.

It is not a de Polignac number, because 3988161531 - 2¹⁵ = 3988128763 is a prime.

It is a super-2 number, since 2×3988161531² = 31810864794696527922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3988161539) 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, 221564521 + ... + 221564538.

Almost surely, 2^3988161531 is an apocalyptic number.

3988161531 is a deficient number, since it is larger than the sum of its proper divisors (1772516249).

3988161531 is a wasteful number, since it uses less digits than its factorization.

3988161531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443129065 (or 443129062 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 3988161531 is about 63151.8925369620. The cubic root of 3988161531 is about 1585.8334712913.

The spelling of 3988161531 in words is "three billion, nine hundred eighty-eight million, one hundred sixty-one thousand, five hundred thirty-one".