264521531 has 2 divisors, whose sum is σ = 264521532. Its totient is φ = 264521530.

The previous prime is 264521503. The next prime is 264521533. The reversal of 264521531 is 135125462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264521531 - 2¹⁰ = 264520507 is a prime.

It is a super-2 number, since 2×264521531² = 139943280725167922, which contains 22 as substring.

Together with 264521533, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 264521494 and 264521503.

It is not a weakly prime, because it can be changed into another prime (264521533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132260765 + 132260766.

It is an arithmetic number, because the mean of its divisors is an integer number (132260766).

Almost surely, 2^264521531 is an apocalyptic number.

264521531 is a deficient number, since it is larger than the sum of its proper divisors (1).

264521531 is an equidigital number, since it uses as much as digits as its factorization.

264521531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 264521531 is about 16264.1178979986. The cubic root of 264521531 is about 641.9290195947.

Adding to 264521531 its reverse (135125462), we get a palindrome (399646993).

The spelling of 264521531 in words is "two hundred sixty-four million, five hundred twenty-one thousand, five hundred thirty-one".