561201311 has 16 divisors (see below), whose sum is σ = 656114688. Its totient is φ = 474804000.

The previous prime is 561201307. The next prime is 561201323. The reversal of 561201311 is 113102165.

It is not a de Polignac number, because 561201311 - 2² = 561201307 is a prime.

It is a super-2 number, since 2×561201311² = 629893822936237442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561201211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20615 + ... + 39336.

It is an arithmetic number, because the mean of its divisors is an integer number (41007168).

Almost surely, 2^561201311 is an apocalyptic number.

561201311 is a deficient number, since it is larger than the sum of its proper divisors (94913377).

561201311 is a wasteful number, since it uses less digits than its factorization.

561201311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60022.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 561201311 is about 23689.6878620213. The cubic root of 561201311 is about 824.8460372623.

Adding to 561201311 its reverse (113102165), we get a palindrome (674303476).

The spelling of 561201311 in words is "five hundred sixty-one million, two hundred one thousand, three hundred eleven".