264640213 has 2 divisors, whose sum is σ = 264640214. Its totient is φ = 264640212.

The previous prime is 264640177. The next prime is 264640219. The reversal of 264640213 is 312046462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 238609809 + 26030404 = 15447^2 + 5102^2 .

It is a cyclic number.

It is not a de Polignac number, because 264640213 - 2⁹ = 264639701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264640219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132320106 + 132320107.

It is an arithmetic number, because the mean of its divisors is an integer number (132320107).

Almost surely, 2^264640213 is an apocalyptic number.

It is an amenable number.

264640213 is a deficient number, since it is larger than the sum of its proper divisors (1).

264640213 is an equidigital number, since it uses as much as digits as its factorization.

264640213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 264640213 is about 16267.7660728202. The cubic root of 264640213 is about 642.0250092967.

Adding to 264640213 its reverse (312046462), we get a palindrome (576686675).

The spelling of 264640213 in words is "two hundred sixty-four million, six hundred forty thousand, two hundred thirteen".