972001531 has 2 divisors, whose sum is σ = 972001532. Its totient is φ = 972001530.

The previous prime is 972001517. The next prime is 972001553. The reversal of 972001531 is 135100279.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 972001531 - 2⁷ = 972001403 is a prime.

It is a super-2 number, since 2×972001531² = 1889573952532687922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 972001531.

It is not a weakly prime, because it can be changed into another prime (972001831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 486000765 + 486000766.

It is an arithmetic number, because the mean of its divisors is an integer number (486000766).

Almost surely, 2^972001531 is an apocalyptic number.

972001531 is a deficient number, since it is larger than the sum of its proper divisors (1).

972001531 is an equidigital number, since it uses as much as digits as its factorization.

972001531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 972001531 is about 31176.9390896541. The cubic root of 972001531 is about 990.5786947556.

The spelling of 972001531 in words is "nine hundred seventy-two million, one thousand, five hundred thirty-one".