997499565001 has 3 divisors (see below), whose sum is σ = 997500563751. Its totient is φ = 997498566252.

The previous prime is 997499564989. The next prime is 997499565031. The reversal of 997499565001 is 100565994799.

The square root of 997499565001 is 998749.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 471555516601 + 525944048400 = 686699^2 + 725220^2 .

It is not a de Polignac number, because 997499565001 - 2⁹ = 997499564489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997499565031) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 499375 + ... + 1498123.

It is an arithmetic number, because the mean of its divisors is an integer number (332500187917).

Almost surely, 2^997499565001 is an apocalyptic number.

997499565001 is the 998749-th square number.

997499565001 is the 499375-th centered octagonal number.

It is an amenable number.

997499565001 is a deficient number, since it is larger than the sum of its proper divisors (998750).

997499565001 is an frugal number, since it uses more digits than its factorization.

997499565001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1997498 (or 998749 counting only the distinct ones).

The product of its (nonzero) digits is 27556200, while the sum is 64.

Multiplying 997499565001 by its sum of digits (64), we get a square (63839972160064 = 7989992²).

It can be divided in two parts, 997499 and 565001, that added together give a square (1562500 = 1250²).

The spelling of 997499565001 in words is "nine hundred ninety-seven billion, four hundred ninety-nine million, five hundred sixty-five thousand, one".