997987569 has 16 divisors (see below), whose sum is σ = 1369222080. Its totient is φ = 646107840.

The previous prime is 997987561. The next prime is 997987577. The reversal of 997987569 is 965789799.

It is an interprime number because it is at equal distance from previous prime (997987561) and next prime (997987577).

It is not a de Polignac number, because 997987569 - 2³ = 997987561 is a prime.

It is a super-2 number, since 2×997987569² = 1991958375757059522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (997987561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51742 + ... + 68360.

It is an arithmetic number, because the mean of its divisors is an integer number (85576380).

Almost surely, 2^997987569 is an apocalyptic number.

It is an amenable number.

997987569 is a deficient number, since it is larger than the sum of its proper divisors (371234511).

997987569 is a wasteful number, since it uses less digits than its factorization.

997987569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17200.

The product of its digits is 77157360, while the sum is 69.

The square root of 997987569 is about 31590.9412490353. The cubic root of 997987569 is about 999.3287391764.

The spelling of 997987569 in words is "nine hundred ninety-seven million, nine hundred eighty-seven thousand, five hundred sixty-nine".