264402431 has 2 divisors, whose sum is σ = 264402432. Its totient is φ = 264402430.

The previous prime is 264402421. The next prime is 264402433. The reversal of 264402431 is 134204462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264402431 - 2¹⁰ = 264401407 is a prime.

It is a super-2 number, since 2×264402431² = 139817291037419522, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 264402433, 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 264402431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264402433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132201215 + 132201216.

It is an arithmetic number, because the mean of its divisors is an integer number (132201216).

Almost surely, 2^264402431 is an apocalyptic number.

264402431 is a deficient number, since it is larger than the sum of its proper divisors (1).

264402431 is an equidigital number, since it uses as much as digits as its factorization.

264402431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 264402431 is about 16260.4560514150. The cubic root of 264402431 is about 641.8326629476.

Adding to 264402431 its reverse (134204462), we get a palindrome (398606893).

The spelling of 264402431 in words is "two hundred sixty-four million, four hundred two thousand, four hundred thirty-one".