981653569 has 6 divisors (see below), whose sum is σ = 1062974166. Its totient is φ = 906141600.

The previous prime is 981653537. The next prime is 981653573. The reversal of 981653569 is 965356189.

It can be written as a sum of positive squares in 3 ways, for example, as 22202944 + 959450625 = 4712^2 + 30975^2 .

It is not a de Polignac number, because 981653569 - 2⁵ = 981653537 is a prime.

It is a super-2 number, since 2×981653569² = 1927287459060875522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981653599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2904132 + ... + 2904469.

It is an arithmetic number, because the mean of its divisors is an integer number (177162361).

Almost surely, 2^981653569 is an apocalyptic number.

It is an amenable number.

981653569 is a deficient number, since it is larger than the sum of its proper divisors (81320597).

981653569 is a wasteful number, since it uses less digits than its factorization.

981653569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5808627 (or 5808614 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 52.

The square root of 981653569 is about 31331.3512156753. The cubic root of 981653569 is about 993.8467380267.

The spelling of 981653569 in words is "nine hundred eighty-one million, six hundred fifty-three thousand, five hundred sixty-nine".