561402185291 has 4 divisors (see below), whose sum is σ = 564223302000. Its totient is φ = 558581068584.

The previous prime is 561402185213. The next prime is 561402185297. The reversal of 561402185291 is 192581204165.

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

It is a cyclic number.

It is not a de Polignac number, because 561402185291 - 2³⁸ = 286524278347 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561402185297) 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, 1410558056 + ... + 1410558453.

It is an arithmetic number, because the mean of its divisors is an integer number (141055825500).

Almost surely, 2^561402185291 is an apocalyptic number.

561402185291 is a deficient number, since it is larger than the sum of its proper divisors (2821116709).

561402185291 is a wasteful number, since it uses less digits than its factorization.

561402185291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821116708.

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 561402185291 in words is "five hundred sixty-one billion, four hundred two million, one hundred eighty-five thousand, two hundred ninety-one".