655981313 has 4 divisors (see below), whose sum is σ = 706441428. Its totient is φ = 605521200.

The previous prime is 655981301. The next prime is 655981351. The reversal of 655981313 is 313189556.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 250683889 + 405297424 = 15833^2 + 20132^2 .

It is a cyclic number.

It is not a de Polignac number, because 655981313 - 2²² = 651787009 is a prime.

It is a super-2 number, since 2×655981313² = 860622966010407938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655980313) 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, 25230038 + ... + 25230063.

It is an arithmetic number, because the mean of its divisors is an integer number (176610357).

Almost surely, 2^655981313 is an apocalyptic number.

It is an amenable number.

655981313 is a deficient number, since it is larger than the sum of its proper divisors (50460115).

655981313 is a wasteful number, since it uses less digits than its factorization.

655981313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50460114.

The product of its digits is 97200, while the sum is 41.

The square root of 655981313 is about 25612.1321447473. The cubic root of 655981313 is about 868.8880465342. Note that the first 3 decimals are identical.

The spelling of 655981313 in words is "six hundred fifty-five million, nine hundred eighty-one thousand, three hundred thirteen".