571640891 has 4 divisors (see below), whose sum is σ = 571690392. Its totient is φ = 571591392.

The previous prime is 571640879. The next prime is 571640893. The reversal of 571640891 is 198046175.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 571640891 - 2¹⁰ = 571639867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (571640893) 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, 2780 + ... + 33926.

It is an arithmetic number, because the mean of its divisors is an integer number (142922598).

Almost surely, 2^571640891 is an apocalyptic number.

571640891 is a deficient number, since it is larger than the sum of its proper divisors (49501).

571640891 is a wasteful number, since it uses less digits than its factorization.

571640891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49500.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 571640891 is about 23909.0127566991. The cubic root of 571640891 is about 829.9292972145.

The spelling of 571640891 in words is "five hundred seventy-one million, six hundred forty thousand, eight hundred ninety-one".