561146391 has 24 divisors (see below), whose sum is σ = 873709200. Its totient is φ = 344998656.

The previous prime is 561146389. The next prime is 561146419. The reversal of 561146391 is 193641165.

561146391 is a `hidden beast` number, since 5 + 6 + 1 + 14 + 639 + 1 = 666.

It is not a de Polignac number, because 561146391 - 2¹ = 561146389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561146321) 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, 206560 + ... + 209258.

It is an arithmetic number, because the mean of its divisors is an integer number (36404550).

Almost surely, 2^561146391 is an apocalyptic number.

561146391 is a deficient number, since it is larger than the sum of its proper divisors (312562809).

561146391 is a wasteful number, since it uses less digits than its factorization.

561146391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4495 (or 4492 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 561146391 is about 23688.5286795107. The cubic root of 561146391 is about 824.8191294954.

The spelling of 561146391 in words is "five hundred sixty-one million, one hundred forty-six thousand, three hundred ninety-one".