4591551631 has 4 divisors (see below), whose sum is σ = 4669374600. Its totient is φ = 4513728664.

The previous prime is 4591551623. The next prime is 4591551649. The reversal of 4591551631 is 1361551954.

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 4591551631 - 2³ = 4591551623 is a prime.

It is a super-2 number, since 2×4591551631² = 42164692760277520322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4591551661) 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, 38911396 + ... + 38911513.

It is an arithmetic number, because the mean of its divisors is an integer number (1167343650).

Almost surely, 2^4591551631 is an apocalyptic number.

4591551631 is a deficient number, since it is larger than the sum of its proper divisors (77822969).

4591551631 is an equidigital number, since it uses as much as digits as its factorization.

4591551631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77822968.

The product of its digits is 81000, while the sum is 40.

The square root of 4591551631 is about 67760.9890054742. The cubic root of 4591551631 is about 1662.0847218434.

The spelling of 4591551631 in words is "four billion, five hundred ninety-one million, five hundred fifty-one thousand, six hundred thirty-one".