571223661 has 8 divisors (see below), whose sum is σ = 762499584. Its totient is φ = 380381760.

The previous prime is 571223629. The next prime is 571223669. The reversal of 571223661 is 166322175.

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

It is not a de Polignac number, because 571223661 - 2⁵ = 571223629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (571223669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105421 + ... + 110706.

It is an arithmetic number, because the mean of its divisors is an integer number (95312448).

Almost surely, 2^571223661 is an apocalyptic number.

It is an amenable number.

571223661 is a deficient number, since it is larger than the sum of its proper divisors (191275923).

571223661 is a wasteful number, since it uses less digits than its factorization.

571223661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217011.

The product of its digits is 15120, while the sum is 33.

The square root of 571223661 is about 23900.2857932703. The cubic root of 571223661 is about 829.7273314431.

The spelling of 571223661 in words is "five hundred seventy-one million, two hundred twenty-three thousand, six hundred sixty-one".