561401026 has 16 divisors (see below), whose sum is σ = 851677560. Its totient is φ = 277516800.

The previous prime is 561401021. The next prime is 561401033. The reversal of 561401026 is 620104165.

It can be written as a sum of positive squares in 4 ways, for example, as 522351025 + 39050001 = 22855^2 + 6249^2 .

It is a super-2 number, since 2×561401026² = 630342223987705352, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561401021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175570 + ... + 178738.

Almost surely, 2^561401026 is an apocalyptic number.

561401026 is a deficient number, since it is larger than the sum of its proper divisors (290276534).

561401026 is a wasteful number, since it uses less digits than its factorization.

561401026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4149.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 561401026 is about 23693.9027177880. The cubic root of 561401026 is about 824.9438717860.

The spelling of 561401026 in words is "five hundred sixty-one million, four hundred one thousand, twenty-six".