5631380971 has 4 divisors (see below), whose sum is σ = 5674368744. Its totient is φ = 5588393200.

The previous prime is 5631380959. The next prime is 5631381001. The reversal of 5631380971 is 1790831365.

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 5631380971 - 2¹⁹ = 5630856683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5631380941) 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, 21493690 + ... + 21493951.

It is an arithmetic number, because the mean of its divisors is an integer number (1418592186).

Almost surely, 2^5631380971 is an apocalyptic number.

5631380971 is a deficient number, since it is larger than the sum of its proper divisors (42987773).

5631380971 is a wasteful number, since it uses less digits than its factorization.

5631380971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42987772.

The product of its (nonzero) digits is 136080, while the sum is 43.

The square root of 5631380971 is about 75042.5277492703. The cubic root of 5631380971 is about 1779.1188850211.

The spelling of 5631380971 in words is "five billion, six hundred thirty-one million, three hundred eighty thousand, nine hundred seventy-one".