265221431 has 2 divisors, whose sum is σ = 265221432. Its totient is φ = 265221430.

The previous prime is 265221391. The next prime is 265221433. The reversal of 265221431 is 134122562.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265221431 is a prime.

It is a super-2 number, since 2×265221431² = 140684814923375522, which contains 22 as substring.

Together with 265221433, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 265221431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265221433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132610715 + 132610716.

It is an arithmetic number, because the mean of its divisors is an integer number (132610716).

Almost surely, 2^265221431 is an apocalyptic number.

265221431 is a deficient number, since it is larger than the sum of its proper divisors (1).

265221431 is an equidigital number, since it uses as much as digits as its factorization.

265221431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 265221431 is about 16285.6203750425. The cubic root of 265221431 is about 642.4946829943.

Adding to 265221431 its reverse (134122562), we get a palindrome (399343993).

The spelling of 265221431 in words is "two hundred sixty-five million, two hundred twenty-one thousand, four hundred thirty-one".