431261511560561 has 24 divisors (see below), whose sum is σ = 475169099233920. Its totient is φ = 391115570677920.

The previous prime is 431261511560543. The next prime is 431261511560641. The reversal of 431261511560561 is 165065115162134.

It is a de Polignac number, because none of the positive numbers 2^k-431261511560561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431261511560261) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 128260280 + ... + 131579718.

It is an arithmetic number, because the mean of its divisors is an integer number (19798712468080).

Almost surely, 2^{431261511560561} is an apocalyptic number.

It is an amenable number.

431261511560561 is a deficient number, since it is larger than the sum of its proper divisors (43907587673359).

431261511560561 is a wasteful number, since it uses less digits than its factorization.

431261511560561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3322037 (or 3322026 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 47.

The spelling of 431261511560561 in words is "four hundred thirty-one trillion, two hundred sixty-one billion, five hundred eleven million, five hundred sixty thousand, five hundred sixty-one".