653986917 has 24 divisors (see below), whose sum is σ = 993266040. Its totient is φ = 414046080.

The previous prime is 653986903. The next prime is 653986937. The reversal of 653986917 is 719689356.

It can be written as a sum of positive squares in 4 ways, for example, as 84162276 + 569824641 = 9174^2 + 23871^2 .

It is not a de Polignac number, because 653986917 - 2¹⁴ = 653970533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (653986937) 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, 4618 + ... + 36459.

It is an arithmetic number, because the mean of its divisors is an integer number (41386085).

Almost surely, 2^653986917 is an apocalyptic number.

It is an amenable number.

653986917 is a deficient number, since it is larger than the sum of its proper divisors (339279123).

653986917 is a wasteful number, since it uses less digits than its factorization.

653986917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41173 (or 41170 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 54.

The square root of 653986917 is about 25573.1679109179. The cubic root of 653986917 is about 868.0065854406.

The spelling of 653986917 in words is "six hundred fifty-three million, nine hundred eighty-six thousand, nine hundred seventeen".