561401251 has 4 divisors (see below), whose sum is σ = 594424872. Its totient is φ = 528377632.

The previous prime is 561401219. The next prime is 561401257. The reversal of 561401251 is 152104165.

It is a happy number.

561401251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 561401251 - 2⁵ = 561401219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561401257) 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, 16511785 + ... + 16511818.

It is an arithmetic number, because the mean of its divisors is an integer number (148606218).

Almost surely, 2^561401251 is an apocalyptic number.

561401251 is a deficient number, since it is larger than the sum of its proper divisors (33023621).

561401251 is a wasteful number, since it uses less digits than its factorization.

561401251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33023620.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 561401251 is about 23693.9074658445. The cubic root of 561401251 is about 824.9439819938.

The spelling of 561401251 in words is "five hundred sixty-one million, four hundred one thousand, two hundred fifty-one".