997545969 has 24 divisors (see below), whose sum is σ = 1719129120. Its totient is φ = 570025512.

The previous prime is 997545889. The next prime is 997545977. The reversal of 997545969 is 969545799.

It is not a de Polignac number, because 997545969 - 2¹³ = 997537777 is a prime.

It is a super-2 number, since 2×997545969² = 1990195920536297922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (997545169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375679 + ... + 378324.

It is an arithmetic number, because the mean of its divisors is an integer number (71630380).

Almost surely, 2^997545969 is an apocalyptic number.

It is an amenable number.

997545969 is a deficient number, since it is larger than the sum of its proper divisors (721583151).

997545969 is a wasteful number, since it uses less digits than its factorization.

997545969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754026 (or 754013 counting only the distinct ones).

The product of its digits is 27556200, while the sum is 63.

The square root of 997545969 is about 31583.9511302813. The cubic root of 997545969 is about 999.1813196120.

The spelling of 997545969 in words is "nine hundred ninety-seven million, five hundred forty-five thousand, nine hundred sixty-nine".