561209902 has 16 divisors (see below), whose sum is σ = 919612800. Its totient is φ = 254742840.

The previous prime is 561209879. The next prime is 561209903. The reversal of 561209902 is 209902165.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561209903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1002 + ... + 33517.

It is an arithmetic number, because the mean of its divisors is an integer number (57475800).

Almost surely, 2^561209902 is an apocalyptic number.

561209902 is a deficient number, since it is larger than the sum of its proper divisors (358402898).

561209902 is a wasteful number, since it uses less digits than its factorization.

561209902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35271.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 561209902 is about 23689.8691849491. The cubic root of 561209902 is about 824.8502462191.

The spelling of 561209902 in words is "five hundred sixty-one million, two hundred nine thousand, nine hundred two".