561117451391 has 16 divisors (see below), whose sum is σ = 654731270400. Its totient is φ = 480688147800.

The previous prime is 561117451387. The next prime is 561117451421. The reversal of 561117451391 is 193154711165.

561117451391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 561117451391 - 2² = 561117451387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561117451291) 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, 155216 + ... + 1070666.

It is an arithmetic number, because the mean of its divisors is an integer number (40920704400).

Almost surely, 2^561117451391 is an apocalyptic number.

561117451391 is a deficient number, since it is larger than the sum of its proper divisors (93613819009).

561117451391 is an equidigital number, since it uses as much as digits as its factorization.

561117451391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917259 (or 917245 counting only the distinct ones).

The product of its digits is 113400, while the sum is 44.

The spelling of 561117451391 in words is "five hundred sixty-one billion, one hundred seventeen million, four hundred fifty-one thousand, three hundred ninety-one".