513255561 has 32 divisors (see below), whose sum is σ = 869449728. Its totient is φ = 261990720.

The previous prime is 513255559. The next prime is 513255563. The reversal of 513255561 is 165552315.

It is an interprime number because it is at equal distance from previous prime (513255559) and next prime (513255563).

It is not a de Polignac number, because 513255561 - 2¹ = 513255559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (513255563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21861 + ... + 38786.

It is an arithmetic number, because the mean of its divisors is an integer number (27170304).

Almost surely, 2^513255561 is an apocalyptic number.

It is an amenable number.

513255561 is a deficient number, since it is larger than the sum of its proper divisors (356194167).

513255561 is a wasteful number, since it uses less digits than its factorization.

513255561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60701.

The product of its digits is 22500, while the sum is 33.

The square root of 513255561 is about 22655.1442502580. The cubic root of 513255561 is about 800.6534042042.

The spelling of 513255561 in words is "five hundred thirteen million, two hundred fifty-five thousand, five hundred sixty-one".