561702121 has 4 divisors (see below), whose sum is σ = 561833044. Its totient is φ = 561571200.

The previous prime is 561702059. The next prime is 561702133. The reversal of 561702121 is 121207165.

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

It can be written as a sum of positive squares in 2 ways, for example, as 155276521 + 406425600 = 12461^2 + 20160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561702121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561702221) 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, 58800 + ... + 67681.

It is an arithmetic number, because the mean of its divisors is an integer number (140458261).

Almost surely, 2^561702121 is an apocalyptic number.

It is an amenable number.

561702121 is a deficient number, since it is larger than the sum of its proper divisors (130923).

561702121 is a wasteful number, since it uses less digits than its factorization.

561702121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130922.

The product of its (nonzero) digits is 840, while the sum is 25.

The square root of 561702121 is about 23700.2557159200. The cubic root of 561702121 is about 825.0913255497.

Adding to 561702121 its reverse (121207165), we get a palindrome (682909286).

The spelling of 561702121 in words is "five hundred sixty-one million, seven hundred two thousand, one hundred twenty-one".