561235577 has 4 divisors (see below), whose sum is σ = 641412096. Its totient is φ = 481059060.

The previous prime is 561235537. The next prime is 561235583. The reversal of 561235577 is 775532165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 775532165 = 5 ⋅155106433.

It is a cyclic number.

It is not a de Polignac number, because 561235577 - 2²⁴ = 544458361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561235537) 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, 40088249 + ... + 40088262.

It is an arithmetic number, because the mean of its divisors is an integer number (160353024).

Almost surely, 2^561235577 is an apocalyptic number.

It is an amenable number.

561235577 is a deficient number, since it is larger than the sum of its proper divisors (80176519).

561235577 is an equidigital number, since it uses as much as digits as its factorization.

561235577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80176518.

The product of its digits is 220500, while the sum is 41.

The square root of 561235577 is about 23690.4110770582. The cubic root of 561235577 is about 824.8628248205.

The spelling of 561235577 in words is "five hundred sixty-one million, two hundred thirty-five thousand, five hundred seventy-seven".