565721139 has 8 divisors (see below), whose sum is σ = 778627072. Its totient is φ = 364981320.

The previous prime is 565721131. The next prime is 565721141. The reversal of 565721139 is 931127565.

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

It is not a de Polignac number, because 565721139 - 2³ = 565721131 is a prime.

It is a super-2 number, since 2×565721139² = 640080814222914642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 565721097 and 565721106.

It is not an unprimeable number, because it can be changed into a prime (565721131) 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, 3041419 + ... + 3041604.

It is an arithmetic number, because the mean of its divisors is an integer number (97328384).

Almost surely, 2^565721139 is an apocalyptic number.

565721139 is a deficient number, since it is larger than the sum of its proper divisors (212905933).

565721139 is a wasteful number, since it uses less digits than its factorization.

565721139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6083057.

The product of its digits is 56700, while the sum is 39.

The square root of 565721139 is about 23784.8930836361. The cubic root of 565721139 is about 827.0545127868.

It can be divided in two parts, 5657 and 21139, that added together give a triangular number (26796 = T₂₃₁).

The spelling of 565721139 in words is "five hundred sixty-five million, seven hundred twenty-one thousand, one hundred thirty-nine".