561401389 has 4 divisors (see below), whose sum is σ = 561456540. Its totient is φ = 561346240.

The previous prime is 561401381. The next prime is 561401429. The reversal of 561401389 is 983104165.

561401389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 419553289 + 141848100 = 20483^2 + 11910^2 .

It is a cyclic number.

It is not a de Polignac number, because 561401389 - 2³ = 561401381 is a prime.

It is a super-2 number, since 2×561401389² = 630343039142258642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561401381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7372 + ... + 34309.

It is an arithmetic number, because the mean of its divisors is an integer number (140364135).

Almost surely, 2^561401389 is an apocalyptic number.

It is an amenable number.

561401389 is a deficient number, since it is larger than the sum of its proper divisors (55151).

561401389 is a wasteful number, since it uses less digits than its factorization.

561401389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55150.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 561401389 is about 23693.9103779853. The cubic root of 561401389 is about 824.9440495879.

The spelling of 561401389 in words is "five hundred sixty-one million, four hundred one thousand, three hundred eighty-nine".