561251251 has 4 divisors (see below), whose sum is σ = 612274104. Its totient is φ = 510228400.

The previous prime is 561251231. The next prime is 561251287. The reversal of 561251251 is 152152165.

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

It is not a de Polignac number, because 561251251 - 2²³ = 552862643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561251231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25511410 + ... + 25511431.

It is an arithmetic number, because the mean of its divisors is an integer number (153068526).

Almost surely, 2^561251251 is an apocalyptic number.

561251251 is a deficient number, since it is larger than the sum of its proper divisors (51022853).

561251251 is a wasteful number, since it uses less digits than its factorization.

561251251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51022852.

The product of its digits is 3000, while the sum is 28.

The square root of 561251251 is about 23690.7418836979. The cubic root of 561251251 is about 824.8705035803.

The spelling of 561251251 in words is "five hundred sixty-one million, two hundred fifty-one thousand, two hundred fifty-one".