264525991 has 2 divisors, whose sum is σ = 264525992. Its totient is φ = 264525990.

The previous prime is 264525979. The next prime is 264526057. The reversal of 264525991 is 199525462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 264525991 - 2¹⁷ = 264394919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264525901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132262995 + 132262996.

It is an arithmetic number, because the mean of its divisors is an integer number (132262996).

Almost surely, 2^264525991 is an apocalyptic number.

264525991 is a deficient number, since it is larger than the sum of its proper divisors (1).

264525991 is an equidigital number, since it uses as much as digits as its factorization.

264525991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 43.

The square root of 264525991 is about 16264.2550090682. The cubic root of 264525991 is about 641.9326273506.

The spelling of 264525991 in words is "two hundred sixty-four million, five hundred twenty-five thousand, nine hundred ninety-one".