264520391 has 16 divisors (see below), whose sum is σ = 290578464. Its totient is φ = 239791104.

The previous prime is 264520387. The next prime is 264520393. The reversal of 264520391 is 193025462.

It is a happy number.

264520391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 264520391 - 2² = 264520387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264520393) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50885 + ... + 55841.

It is an arithmetic number, because the mean of its divisors is an integer number (18161154).

Almost surely, 2^264520391 is an apocalyptic number.

264520391 is a deficient number, since it is larger than the sum of its proper divisors (26058073).

264520391 is a wasteful number, since it uses less digits than its factorization.

264520391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5090.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 264520391 is about 16264.0828514860. The cubic root of 264520391 is about 641.9280974264.

The spelling of 264520391 in words is "two hundred sixty-four million, five hundred twenty thousand, three hundred ninety-one".