561777 has 8 divisors (see below), whose sum is σ = 753600. Its totient is φ = 372240.

The previous prime is 561767. The next prime is 561787. The reversal of 561777 is 777165.

It is an interprime number because it is at equal distance from previous prime (561767) and next prime (561787).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 561777 - 2⁴ = 561761 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561767) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 1067.

It is an arithmetic number, because the mean of its divisors is an integer number (94200).

2⁵⁶¹⁷⁷⁷ is an apocalyptic number.

It is an amenable number.

561777 is a deficient number, since it is larger than the sum of its proper divisors (191823).

561777 is a wasteful number, since it uses less digits than its factorization.

561777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143.

The product of its digits is 10290, while the sum is 33.

The square root of 561777 is about 749.5178450177. The cubic root of 561777 is about 82.5127987490.

The spelling of 561777 in words is "five hundred sixty-one thousand, seven hundred seventy-seven".