561900169 has 2 divisors, whose sum is σ = 561900170. Its totient is φ = 561900168.

The previous prime is 561900161. The next prime is 561900193. The reversal of 561900169 is 961009165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 557573769 + 4326400 = 23613^2 + 2080^2 .

It is a cyclic number.

It is not a de Polignac number, because 561900169 - 2³ = 561900161 is a prime.

It is a super-2 number, since 2×561900169² = 631463599844457122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (561900161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280950084 + 280950085.

It is an arithmetic number, because the mean of its divisors is an integer number (280950085).

Almost surely, 2^561900169 is an apocalyptic number.

It is an amenable number.

561900169 is a deficient number, since it is larger than the sum of its proper divisors (1).

561900169 is an equidigital number, since it uses as much as digits as its factorization.

561900169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 37.

The square root of 561900169 is about 23704.4335304601. The cubic root of 561900169 is about 825.1882858895.

It can be divided in two parts, 56190016 and 9, that multiplied together give a square (505710144 = 22488²).

The spelling of 561900169 in words is "five hundred sixty-one million, nine hundred thousand, one hundred sixty-nine".