561994990 has 8 divisors (see below), whose sum is σ = 1011591000. Its totient is φ = 224797992.

The previous prime is 561994957. The next prime is 561995003. The reversal of 561994990 is 99499165.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28099740 + ... + 28099759.

It is an arithmetic number, because the mean of its divisors is an integer number (126448875).

Almost surely, 2^561994990 is an apocalyptic number.

561994990 is a deficient number, since it is larger than the sum of its proper divisors (449596010).

561994990 is a wasteful number, since it uses less digits than its factorization.

561994990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56199506.

The product of its (nonzero) digits is 787320, while the sum is 52.

The square root of 561994990 is about 23706.4335149765. The cubic root of 561994990 is about 825.2347002895.

The spelling of 561994990 in words is "five hundred sixty-one million, nine hundred ninety-four thousand, nine hundred ninety".