561979149 has 16 divisors (see below), whose sum is σ = 793991808. Its totient is φ = 352343552.

The previous prime is 561979147. The next prime is 561979163. The reversal of 561979149 is 941979165.

It is a cyclic number.

It is not a de Polignac number, because 561979149 - 2¹ = 561979147 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561979147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78529 + ... + 85385.

It is an arithmetic number, because the mean of its divisors is an integer number (49624488).

Almost surely, 2^561979149 is an apocalyptic number.

It is an amenable number.

561979149 is a deficient number, since it is larger than the sum of its proper divisors (232012659).

561979149 is a wasteful number, since it uses less digits than its factorization.

561979149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8484.

The product of its digits is 612360, while the sum is 51.

The square root of 561979149 is about 23706.0994050055. The cubic root of 561979149 is about 825.2269465634.

The spelling of 561979149 in words is "five hundred sixty-one million, nine hundred seventy-nine thousand, one hundred forty-nine".