2565220531 has 2 divisors, whose sum is σ = 2565220532. Its totient is φ = 2565220530.

The previous prime is 2565220517. The next prime is 2565220543. The reversal of 2565220531 is 1350225652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2565220531 - 2¹⁹ = 2564696243 is a prime.

It is a super-2 number, since 2×2565220531² = 13160712745327843922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2565220493 and 2565220502.

It is not a weakly prime, because it can be changed into another prime (2565220501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282610265 + 1282610266.

It is an arithmetic number, because the mean of its divisors is an integer number (1282610266).

Almost surely, 2^2565220531 is an apocalyptic number.

2565220531 is a deficient number, since it is larger than the sum of its proper divisors (1).

2565220531 is an equidigital number, since it uses as much as digits as its factorization.

2565220531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18000, while the sum is 31.

The square root of 2565220531 is about 50648.0061897801. The cubic root of 2565220531 is about 1368.9100199589.

The spelling of 2565220531 in words is "two billion, five hundred sixty-five million, two hundred twenty thousand, five hundred thirty-one".