561115023 has 24 divisors (see below), whose sum is σ = 875150640. Its totient is φ = 318850560.

The previous prime is 561115003. The next prime is 561115091. The reversal of 561115023 is 320511165.

It is not a de Polignac number, because 561115023 - 2⁹ = 561114511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 561114984 and 561115002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561115003) 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, 16063 + ... + 37151.

It is an arithmetic number, because the mean of its divisors is an integer number (36464610).

Almost surely, 2^561115023 is an apocalyptic number.

561115023 is a deficient number, since it is larger than the sum of its proper divisors (314035617).

561115023 is a wasteful number, since it uses less digits than its factorization.

561115023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21287 (or 21280 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 561115023 is about 23687.8665776384. The cubic root of 561115023 is about 824.8037601200.

Adding to 561115023 its reverse (320511165), we get a palindrome (881626188).

The spelling of 561115023 in words is "five hundred sixty-one million, one hundred fifteen thousand, twenty-three".