571213661 has 4 divisors (see below), whose sum is σ = 571428000. Its totient is φ = 570999324.

The previous prime is 571213631. The next prime is 571213679. The reversal of 571213661 is 166312175.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-571213661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (571213631) 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, 103121 + ... + 108518.

It is an arithmetic number, because the mean of its divisors is an integer number (142857000).

Almost surely, 2^571213661 is an apocalyptic number.

It is an amenable number.

571213661 is a deficient number, since it is larger than the sum of its proper divisors (214339).

571213661 is a wasteful number, since it uses less digits than its factorization.

571213661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214338.

The product of its digits is 7560, while the sum is 32.

The square root of 571213661 is about 23900.0765898354. The cubic root of 571213661 is about 829.7224896025.

The spelling of 571213661 in words is "five hundred seventy-one million, two hundred thirteen thousand, six hundred sixty-one".