897521531 has 4 divisors (see below), whose sum is σ = 898569672. Its totient is φ = 896473392.

The previous prime is 897521509. The next prime is 897521591. The reversal of 897521531 is 135125798.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135125798 = 2 ⋅67562899.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-897521531 is a prime.

It is a super-2 number, since 2×897521531² = 1611089797217167922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (897521591) 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, 522785 + ... + 524498.

It is an arithmetic number, because the mean of its divisors is an integer number (224642418).

Almost surely, 2^897521531 is an apocalyptic number.

897521531 is a deficient number, since it is larger than the sum of its proper divisors (1048141).

897521531 is a wasteful number, since it uses less digits than its factorization.

897521531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048140.

The product of its digits is 75600, while the sum is 41.

The square root of 897521531 is about 29958.6637051788. The cubic root of 897521531 is about 964.6022973926.

The spelling of 897521531 in words is "eight hundred ninety-seven million, five hundred twenty-one thousand, five hundred thirty-one".