567121721 has 4 divisors (see below), whose sum is σ = 572422032. Its totient is φ = 561821412.

The previous prime is 567121673. The next prime is 567121729. The reversal of 567121721 is 127121765.

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-567121721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (567121729) 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, 2649995 + ... + 2650208.

It is an arithmetic number, because the mean of its divisors is an integer number (143105508).

Almost surely, 2^567121721 is an apocalyptic number.

It is an amenable number.

567121721 is a deficient number, since it is larger than the sum of its proper divisors (5300311).

567121721 is a wasteful number, since it uses less digits than its factorization.

567121721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5300310.

The product of its digits is 5880, while the sum is 32.

The square root of 567121721 is about 23814.3175631803. The cubic root of 567121721 is about 827.7364760152.

The spelling of 567121721 in words is "five hundred sixty-seven million, one hundred twenty-one thousand, seven hundred twenty-one".