997921569 has 8 divisors (see below), whose sum is σ = 1330755712. Its totient is φ = 665184240.

The previous prime is 997921541. The next prime is 997921571. The reversal of 997921569 is 965129799.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 997921569 - 2²⁵ = 964367137 is a prime.

It is a super-2 number, since 2×997921569² = 1991694915750843522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (997921579) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4824 + ... + 44934.

It is an arithmetic number, because the mean of its divisors is an integer number (166344464).

Almost surely, 2^997921569 is an apocalyptic number.

It is an amenable number.

997921569 is a deficient number, since it is larger than the sum of its proper divisors (332834143).

997921569 is a wasteful number, since it uses less digits than its factorization.

997921569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48407.

The product of its digits is 2755620, while the sum is 57.

The square root of 997921569 is about 31589.8966285108. The cubic root of 997921569 is about 999.3067091255.

The spelling of 997921569 in words is "nine hundred ninety-seven million, nine hundred twenty-one thousand, five hundred sixty-nine".