561401033 has 2 divisors, whose sum is σ = 561401034. Its totient is φ = 561401032.

The previous prime is 561401021. The next prime is 561401039. The reversal of 561401033 is 330104165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 356567689 + 204833344 = 18883^2 + 14312^2 .

It is a cyclic number.

It is not a de Polignac number, because 561401033 - 2¹⁶ = 561335497 is a prime.

It is a super-2 number, since 2×561401033² = 630342239706934178, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (561401039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280700516 + 280700517.

It is an arithmetic number, because the mean of its divisors is an integer number (280700517).

Almost surely, 2^561401033 is an apocalyptic number.

It is an amenable number.

561401033 is a deficient number, since it is larger than the sum of its proper divisors (1).

561401033 is an equidigital number, since it uses as much as digits as its factorization.

561401033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 561401033 is about 23693.9028655053. The cubic root of 561401033 is about 824.9438752147.

Adding to 561401033 its reverse (330104165), we get a palindrome (891505198).

The spelling of 561401033 in words is "five hundred sixty-one million, four hundred one thousand, thirty-three".