264787261 has 2 divisors, whose sum is σ = 264787262. Its totient is φ = 264787260.

The previous prime is 264787241. The next prime is 264787267. The reversal of 264787261 is 162787462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146652100 + 118135161 = 12110^2 + 10869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-264787261 is a prime.

It is a super-2 number, since 2×264787261² = 140224587175764242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264787267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132393630 + 132393631.

It is an arithmetic number, because the mean of its divisors is an integer number (132393631).

Almost surely, 2^264787261 is an apocalyptic number.

It is an amenable number.

264787261 is a deficient number, since it is larger than the sum of its proper divisors (1).

264787261 is an equidigital number, since it uses as much as digits as its factorization.

264787261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 43.

The square root of 264787261 is about 16272.2850577293. The cubic root of 264787261 is about 642.1439015490.

The spelling of 264787261 in words is "two hundred sixty-four million, seven hundred eighty-seven thousand, two hundred sixty-one".