3139531 has 4 divisors (see below), whose sum is σ = 3155992. Its totient is φ = 3123072.

The previous prime is 3139519. The next prime is 3139537. The reversal of 3139531 is 1359313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3139531 - 2⁷ = 3139403 is a prime.

It is a super-2 number, since 2×3139531² = 19713309799922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3139496 and 3139505.

It is not an unprimeable number, because it can be changed into a prime (3139537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7941 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (788998).

Almost surely, 2^3139531 is an apocalyptic number.

3139531 is a deficient number, since it is larger than the sum of its proper divisors (16461).

3139531 is a wasteful number, since it uses less digits than its factorization.

3139531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16460.

The product of its digits is 1215, while the sum is 25.

The square root of 3139531 is about 1771.8721737191. The cubic root of 3139531 is about 146.4271440557.

The spelling of 3139531 in words is "three million, one hundred thirty-nine thousand, five hundred thirty-one".