561645701 has 8 divisors (see below), whose sum is σ = 564280824. Its totient is φ = 559016640.

The previous prime is 561645691. The next prime is 561645731. The reversal of 561645701 is 107546165.

It can be written as a sum of positive squares in 4 ways, for example, as 175562500 + 386083201 = 13250^2 + 19649^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561645701 - 2²⁶ = 494536837 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 (561645731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345671 + ... + 347291.

It is an arithmetic number, because the mean of its divisors is an integer number (70535103).

Almost surely, 2^561645701 is an apocalyptic number.

It is an amenable number.

561645701 is a deficient number, since it is larger than the sum of its proper divisors (2635123).

561645701 is a wasteful number, since it uses less digits than its factorization.

561645701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 561645701 is about 23699.0654035133. The cubic root of 561645701 is about 825.0636992750.

The spelling of 561645701 in words is "five hundred sixty-one million, six hundred forty-five thousand, seven hundred one".