3915631 has 2 divisors, whose sum is σ = 3915632. Its totient is φ = 3915630.

The previous prime is 3915629. The next prime is 3915683. The reversal of 3915631 is 1365193.

It is a weak prime.

It is an emirp because it is prime and its reverse (1365193) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3915631 - 2¹ = 3915629 is a prime.

It is a super-2 number, since 2×3915631² = 30664332256322, which contains 22 as substring.

Together with 3915629, it forms a pair of twin primes.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3915631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3915601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1957815 + 1957816.

It is an arithmetic number, because the mean of its divisors is an integer number (1957816).

Almost surely, 2^3915631 is an apocalyptic number.

3915631 is the 1252-nd centered pentagonal number.

3915631 is a deficient number, since it is larger than the sum of its proper divisors (1).

3915631 is an equidigital number, since it uses as much as digits as its factorization.

3915631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2430, while the sum is 28.

The square root of 3915631 is about 1978.7953406050. The cubic root of 3915631 is about 157.6161031885.

The spelling of 3915631 in words is "three million, nine hundred fifteen thousand, six hundred thirty-one".