561221506 has 16 divisors (see below), whose sum is σ = 893988000. Its totient is φ = 263487168.

The previous prime is 561221497. The next prime is 561221537. The reversal of 561221506 is 605122165.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61056 + ... + 69643.

It is an arithmetic number, because the mean of its divisors is an integer number (55874250).

Almost surely, 2^561221506 is an apocalyptic number.

561221506 is a deficient number, since it is larger than the sum of its proper divisors (332766494).

561221506 is a wasteful number, since it uses less digits than its factorization.

561221506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130833.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 561221506 is about 23690.1140985011. The cubic root of 561221506 is about 824.8559312555.

The spelling of 561221506 in words is "five hundred sixty-one million, two hundred twenty-one thousand, five hundred six".