264979721 has 2 divisors, whose sum is σ = 264979722. Its totient is φ = 264979720.

The previous prime is 264979709. The next prime is 264979747. The reversal of 264979721 is 127979462.

264979721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 258405625 + 6574096 = 16075^2 + 2564^2 .

It is a cyclic number.

It is not a de Polignac number, because 264979721 - 2¹⁴ = 264963337 is a prime.

It is not a weakly prime, because it can be changed into another prime (264979751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132489860 + 132489861.

It is an arithmetic number, because the mean of its divisors is an integer number (132489861).

Almost surely, 2^264979721 is an apocalyptic number.

It is an amenable number.

264979721 is a deficient number, since it is larger than the sum of its proper divisors (1).

264979721 is an equidigital number, since it uses as much as digits as its factorization.

264979721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 381024, while the sum is 47.

The square root of 264979721 is about 16278.1977196494. The cubic root of 264979721 is about 642.2994441330.

The spelling of 264979721 in words is "two hundred sixty-four million, nine hundred seventy-nine thousand, seven hundred twenty-one".