264406621 has 2 divisors, whose sum is σ = 264406622. Its totient is φ = 264406620.

The previous prime is 264406573. The next prime is 264406651. The reversal of 264406621 is 126604462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 242923396 + 21483225 = 15586^2 + 4635^2 .

It is a cyclic number.

It is not a de Polignac number, because 264406621 - 2¹⁵ = 264373853 is a prime.

It is a super-2 number, since 2×264406621² = 139821722457275282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264406651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132203310 + 132203311.

It is an arithmetic number, because the mean of its divisors is an integer number (132203311).

Almost surely, 2^264406621 is an apocalyptic number.

It is an amenable number.

264406621 is a deficient number, since it is larger than the sum of its proper divisors (1).

264406621 is an equidigital number, since it uses as much as digits as its factorization.

264406621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 264406621 is about 16260.5848910794. The cubic root of 264406621 is about 641.8360533157.

The spelling of 264406621 in words is "two hundred sixty-four million, four hundred six thousand, six hundred twenty-one".