561091319 has 4 divisors (see below), whose sum is σ = 561439080. Its totient is φ = 560743560.

The previous prime is 561091303. The next prime is 561091327. The reversal of 561091319 is 913190165.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 913190165 = 5 ⋅182638033.

It is a cyclic number.

It is not a de Polignac number, because 561091319 - 2⁴ = 561091303 is a prime.

It is a super-2 number, since 2×561091319² = 629646936514319522, 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 (561091369) 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, 171449 + ... + 174690.

It is an arithmetic number, because the mean of its divisors is an integer number (140359770).

Almost surely, 2^561091319 is an apocalyptic number.

561091319 is a deficient number, since it is larger than the sum of its proper divisors (347761).

561091319 is a wasteful number, since it uses less digits than its factorization.

561091319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347760.

The product of its (nonzero) digits is 7290, while the sum is 35.

The square root of 561091319 is about 23687.3662318123. The cubic root of 561091319 is about 824.7921454939.

The spelling of 561091319 in words is "five hundred sixty-one million, ninety-one thousand, three hundred nineteen".