552001561 has 2 divisors, whose sum is σ = 552001562. Its totient is φ = 552001560.

The previous prime is 552001559. The next prime is 552001579. The reversal of 552001561 is 165100255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 507645961 + 44355600 = 22531^2 + 6660^2 .

It is a cyclic number.

It is not a de Polignac number, because 552001561 - 2¹ = 552001559 is a prime.

Together with 552001559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (552001591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276000780 + 276000781.

It is an arithmetic number, because the mean of its divisors is an integer number (276000781).

Almost surely, 2^552001561 is an apocalyptic number.

It is an amenable number.

552001561 is a deficient number, since it is larger than the sum of its proper divisors (1).

552001561 is an equidigital number, since it uses as much as digits as its factorization.

552001561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 552001561 is about 23494.7134692041. The cubic root of 552001561 is about 820.3139591939.

The spelling of 552001561 in words is "five hundred fifty-two million, one thousand, five hundred sixty-one".