561231229172 has 24 divisors (see below), whose sum is σ = 1041249936384. Its totient is φ = 263773199232.

The previous prime is 561231229151. The next prime is 561231229187. The reversal of 561231229172 is 271922132165.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5190068 + ... + 5297099.

It is an arithmetic number, because the mean of its divisors is an integer number (43385414016).

Almost surely, 2^561231229172 is an apocalyptic number.

It is an amenable number.

561231229172 is a deficient number, since it is larger than the sum of its proper divisors (480018707212).

561231229172 is a wasteful number, since it uses less digits than its factorization.

561231229172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10487975 (or 10487973 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The spelling of 561231229172 in words is "five hundred sixty-one billion, two hundred thirty-one million, two hundred twenty-nine thousand, one hundred seventy-two".