561123000901 has 4 divisors (see below), whose sum is σ = 561125101932. Its totient is φ = 561120899872.

The previous prime is 561123000871. The next prime is 561123000929. The reversal of 561123000901 is 109000321165.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 291787950276 + 269335050625 = 540174^2 + 518975^2 .

It is a cyclic number.

It is not a de Polignac number, because 561123000901 - 2⁵ = 561123000869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 561123000901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561123000941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 579520 + ... + 1207513.

It is an arithmetic number, because the mean of its divisors is an integer number (140281275483).

Almost surely, 2^561123000901 is an apocalyptic number.

It is an amenable number.

561123000901 is a deficient number, since it is larger than the sum of its proper divisors (2101031).

561123000901 is a wasteful number, since it uses less digits than its factorization.

561123000901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2101030.

The product of its (nonzero) digits is 1620, while the sum is 28.

The spelling of 561123000901 in words is "five hundred sixty-one billion, one hundred twenty-three million, nine hundred one", and thus it is an aban number.