561403761 has 8 divisors (see below), whose sum is σ = 748858464. Its totient is φ = 374109120.

The previous prime is 561403729. The next prime is 561403781. The reversal of 561403761 is 167304165.

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

It is not a de Polignac number, because 561403761 - 2⁵ = 561403729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561403781) 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, 31576 + ... + 46041.

It is an arithmetic number, because the mean of its divisors is an integer number (93607308).

Almost surely, 2^561403761 is an apocalyptic number.

It is an amenable number.

561403761 is a deficient number, since it is larger than the sum of its proper divisors (187454703).

561403761 is a wasteful number, since it uses less digits than its factorization.

561403761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80031.

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

The square root of 561403761 is about 23693.9604329880. The cubic root of 561403761 is about 824.9452114212.

The spelling of 561403761 in words is "five hundred sixty-one million, four hundred three thousand, seven hundred sixty-one".