561161245 has 32 divisors (see below), whose sum is σ = 747740160. Its totient is φ = 402124800.

The previous prime is 561161243. The next prime is 561161261. The reversal of 561161245 is 542161165.

It is not a de Polignac number, because 561161245 - 2¹ = 561161243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561161243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 466645 + ... + 467845.

It is an arithmetic number, because the mean of its divisors is an integer number (23366880).

Almost surely, 2^561161245 is an apocalyptic number.

It is an amenable number.

561161245 is a deficient number, since it is larger than the sum of its proper divisors (186578915).

561161245 is a wasteful number, since it uses less digits than its factorization.

561161245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1485.

The product of its digits is 7200, while the sum is 31.

The square root of 561161245 is about 23688.8422047174. The cubic root of 561161245 is about 824.8264073083.

The spelling of 561161245 in words is "five hundred sixty-one million, one hundred sixty-one thousand, two hundred forty-five".