561401011 has 2 divisors, whose sum is σ = 561401012. Its totient is φ = 561401010.

The previous prime is 561400993. The next prime is 561401021. The reversal of 561401011 is 110104165.

561401011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 561401011 - 2¹⁷ = 561269939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561401011.

It is not a weakly prime, because it can be changed into another prime (561401021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280700505 + 280700506.

It is an arithmetic number, because the mean of its divisors is an integer number (280700506).

Almost surely, 2^561401011 is an apocalyptic number.

561401011 is a deficient number, since it is larger than the sum of its proper divisors (1).

561401011 is an equidigital number, since it uses as much as digits as its factorization.

561401011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 561401011 is about 23693.9024012508. The cubic root of 561401011 is about 824.9438644388.

Adding to 561401011 its reverse (110104165), we get a palindrome (671505176).

The spelling of 561401011 in words is "five hundred sixty-one million, four hundred one thousand, eleven".