997464521 has 2 divisors, whose sum is σ = 997464522. Its totient is φ = 997464520.

The previous prime is 997464509. The next prime is 997464553. The reversal of 997464521 is 125464799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678342025 + 319122496 = 26045^2 + 17864^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997464521 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (997464581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498732260 + 498732261.

It is an arithmetic number, because the mean of its divisors is an integer number (498732261).

Almost surely, 2^997464521 is an apocalyptic number.

It is an amenable number.

997464521 is a deficient number, since it is larger than the sum of its proper divisors (1).

997464521 is an equidigital number, since it uses as much as digits as its factorization.

997464521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 47.

The square root of 997464521 is about 31582.6617149347. The cubic root of 997464521 is about 999.1541250306.

The spelling of 997464521 in words is "nine hundred ninety-seven million, four hundred sixty-four thousand, five hundred twenty-one".