5631502991 has 8 divisors (see below), whose sum is σ = 5656001904. Its totient is φ = 5607024640.

The previous prime is 5631502979. The next prime is 5631502999. The reversal of 5631502991 is 1992051365.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5631502991 - 2¹⁴ = 5631486607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5631502999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 824396 + ... + 831198.

It is an arithmetic number, because the mean of its divisors is an integer number (707000238).

Almost surely, 2^5631502991 is an apocalyptic number.

5631502991 is a deficient number, since it is larger than the sum of its proper divisors (24498913).

5631502991 is a wasteful number, since it uses less digits than its factorization.

5631502991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10281.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 5631502991 is about 75043.3407505290. The cubic root of 5631502991 is about 1779.1317348306.

The spelling of 5631502991 in words is "five billion, six hundred thirty-one million, five hundred two thousand, nine hundred ninety-one".