561772071 has 32 divisors (see below), whose sum is σ = 953671680. Its totient is φ = 320161248.

The previous prime is 561772067. The next prime is 561772091. The reversal of 561772071 is 170277165.

561772071 is a `hidden beast` number, since 561 + 7 + 7 + 20 + 71 = 666.

It is not a de Polignac number, because 561772071 - 2² = 561772067 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561772091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 71290 + ... + 78776.

It is an arithmetic number, because the mean of its divisors is an integer number (29802240).

Almost surely, 2^561772071 is an apocalyptic number.

561772071 is a deficient number, since it is larger than the sum of its proper divisors (391899609).

561772071 is a wasteful number, since it uses less digits than its factorization.

561772071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7900 (or 7894 counting only the distinct ones).

The product of its (nonzero) digits is 20580, while the sum is 36.

The square root of 561772071 is about 23701.7313924532. The cubic root of 561772071 is about 825.1255742736.

The spelling of 561772071 in words is "five hundred sixty-one million, seven hundred seventy-two thousand, seventy-one".