561553147 has 2 divisors, whose sum is σ = 561553148. Its totient is φ = 561553146.

The previous prime is 561553121. The next prime is 561553159. The reversal of 561553147 is 741355165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561553147 - 2⁷ = 561553019 is a prime.

It is not a weakly prime, because it can be changed into another prime (561553117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280776573 + 280776574.

It is an arithmetic number, because the mean of its divisors is an integer number (280776574).

Almost surely, 2^561553147 is an apocalyptic number.

561553147 is a deficient number, since it is larger than the sum of its proper divisors (1).

561553147 is an equidigital number, since it uses as much as digits as its factorization.

561553147 is an evil number, because the sum of its binary digits is even.

The product of its digits is 63000, while the sum is 37.

The square root of 561553147 is about 23697.1126300231. The cubic root of 561553147 is about 825.0183758380.

It can be divided in two parts, 56 and 1553147, that added together give a triangular number (1553203 = T₁₇₆₂).

The spelling of 561553147 in words is "five hundred sixty-one million, five hundred fifty-three thousand, one hundred forty-seven".