561261723 has 8 divisors (see below), whose sum is σ = 816380736. Its totient is φ = 340158600.

The previous prime is 561261719. The next prime is 561261739. The reversal of 561261723 is 327162165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561261723 - 2² = 561261719 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 17007931 = 561261723 / (5 + 6 + 1 + 2 + 6 + 1 + 7 + 2 + 3).

It is not an unprimeable number, because it can be changed into a prime (561261223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8503933 + ... + 8503998.

It is an arithmetic number, because the mean of its divisors is an integer number (102047592).

Almost surely, 2^561261723 is an apocalyptic number.

561261723 is a deficient number, since it is larger than the sum of its proper divisors (255119013).

561261723 is a wasteful number, since it uses less digits than its factorization.

561261723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17007945.

The product of its digits is 15120, while the sum is 33.

The square root of 561261723 is about 23690.9628972737. The cubic root of 561261723 is about 824.8756337784.

The spelling of 561261723 in words is "five hundred sixty-one million, two hundred sixty-one thousand, seven hundred twenty-three".