264624421 has 2 divisors, whose sum is σ = 264624422. Its totient is φ = 264624420.

The previous prime is 264624413. The next prime is 264624443. The reversal of 264624421 is 124426462.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252969025 + 11655396 = 15905^2 + 3414^2 .

It is a cyclic number.

It is not a de Polignac number, because 264624421 - 2³ = 264624413 is a prime.

It is equal to p_14434393 and since 264624421 and 14434393 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264624461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132312210 + 132312211.

It is an arithmetic number, because the mean of its divisors is an integer number (132312211).

Almost surely, 2^264624421 is an apocalyptic number.

It is an amenable number.

264624421 is a deficient number, since it is larger than the sum of its proper divisors (1).

264624421 is an equidigital number, since it uses as much as digits as its factorization.

264624421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18432, while the sum is 31.

The square root of 264624421 is about 16267.2806885478. The cubic root of 264624421 is about 642.0122384225.

The spelling of 264624421 in words is "two hundred sixty-four million, six hundred twenty-four thousand, four hundred twenty-one".