5991631 has 4 divisors (see below), whose sum is σ = 6307000. Its totient is φ = 5676264.

The previous prime is 5991589. The next prime is 5991641. The reversal of 5991631 is 1361995.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1361995 = 5 ⋅272399.

It is a cyclic number.

It is not a de Polignac number, because 5991631 - 2¹⁷ = 5860559 is a prime.

It is a super-2 number, since 2×5991631² = 71799284080322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5991641) 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, 157656 + ... + 157693.

It is an arithmetic number, because the mean of its divisors is an integer number (1576750).

Almost surely, 2^5991631 is an apocalyptic number.

5991631 is a deficient number, since it is larger than the sum of its proper divisors (315369).

5991631 is a wasteful number, since it uses less digits than its factorization.

5991631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315368.

The product of its digits is 7290, while the sum is 34.

The square root of 5991631 is about 2447.7808316922. The cubic root of 5991631 is about 181.6275339590.

The spelling of 5991631 in words is "five million, nine hundred ninety-one thousand, six hundred thirty-one".