971568531 has 12 divisors (see below), whose sum is σ = 1436014008. Its totient is φ = 632649024.

The previous prime is 971568529. The next prime is 971568571. The reversal of 971568531 is 135865179.

It is a happy number.

It is not a de Polignac number, because 971568531 - 2¹ = 971568529 is a prime.

It is a super-2 number, since 2×971568531² = 1887890820858995922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (971568571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1254870 + ... + 1255643.

It is an arithmetic number, because the mean of its divisors is an integer number (119667834).

Almost surely, 2^971568531 is an apocalyptic number.

971568531 is a deficient number, since it is larger than the sum of its proper divisors (464445477).

971568531 is a wasteful number, since it uses less digits than its factorization.

971568531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510562 (or 2510559 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 971568531 is about 31169.9940808464. The cubic root of 971568531 is about 990.4315810363.

The spelling of 971568531 in words is "nine hundred seventy-one million, five hundred sixty-eight thousand, five hundred thirty-one".