649561553 has 4 divisors (see below), whose sum is σ = 649952880. Its totient is φ = 649170228.

The previous prime is 649561541. The next prime is 649561559. The reversal of 649561553 is 355165946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 649561553 - 2⁴ = 649561537 is a prime.

It is a super-2 number, since 2×649561553² = 843860422271543618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649561559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193163 + ... + 196496.

It is an arithmetic number, because the mean of its divisors is an integer number (162488220).

Almost surely, 2^649561553 is an apocalyptic number.

It is an amenable number.

649561553 is a deficient number, since it is larger than the sum of its proper divisors (391327).

649561553 is a wasteful number, since it uses less digits than its factorization.

649561553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391326.

The product of its digits is 486000, while the sum is 44.

The square root of 649561553 is about 25486.4974643437. The cubic root of 649561553 is about 866.0442923332.

The spelling of 649561553 in words is "six hundred forty-nine million, five hundred sixty-one thousand, five hundred fifty-three".