617561385 has 128 divisors (see below), whose sum is σ = 1243938816. Its totient is φ = 255467520.

The previous prime is 617561383. The next prime is 617561401. The reversal of 617561385 is 583165716.

It is not a de Polignac number, because 617561385 - 2¹ = 617561383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (617561383) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5465089 + ... + 5465201.

It is an arithmetic number, because the mean of its divisors is an integer number (9718272).

Almost surely, 2^617561385 is an apocalyptic number.

It is an amenable number.

617561385 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

617561385 is a wasteful number, since it uses less digits than its factorization.

617561385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255.

The product of its digits is 151200, while the sum is 42.

The square root of 617561385 is about 24850.7823820499. The cubic root of 617561385 is about 851.5824661267.

The spelling of 617561385 in words is "six hundred seventeen million, five hundred sixty-one thousand, three hundred eighty-five".