264091389 has 4 divisors (see below), whose sum is σ = 352121856. Its totient is φ = 176060924.

The previous prime is 264091367. The next prime is 264091411. The reversal of 264091389 is 983190462.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (264091367) and next prime (264091411).

It is a cyclic number.

It is not a de Polignac number, because 264091389 - 2¹² = 264087293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264091389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264091319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44015229 + ... + 44015234.

It is an arithmetic number, because the mean of its divisors is an integer number (88030464).

Almost surely, 2^264091389 is an apocalyptic number.

It is an amenable number.

264091389 is a deficient number, since it is larger than the sum of its proper divisors (88030467).

264091389 is an equidigital number, since it uses as much as digits as its factorization.

264091389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88030466.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 264091389 is about 16250.8888679973. Note that the first 4 decimals coincide. The cubic root of 264091389 is about 641.5808810337.

The spelling of 264091389 in words is "two hundred sixty-four million, ninety-one thousand, three hundred eighty-nine".