5265991 has 4 divisors (see below), whose sum is σ = 5270584. Its totient is φ = 5261400.

The previous prime is 5265979. The next prime is 5266013. The reversal of 5265991 is 1995625.

5265991 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5265991 - 2¹⁵ = 5233223 is a prime.

It is a super-2 number, since 2×5265991² = 55461322424162, which contains 22 as substring.

It is a Duffinian number.

5265991 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5265991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5265901) 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, 1036 + ... + 3406.

It is an arithmetic number, because the mean of its divisors is an integer number (1317646).

Almost surely, 2^5265991 is an apocalyptic number.

5265991 is a deficient number, since it is larger than the sum of its proper divisors (4593).

5265991 is a wasteful number, since it uses less digits than its factorization.

5265991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4592.

The product of its digits is 24300, while the sum is 37.

The square root of 5265991 is about 2294.7747166116. The cubic root of 5265991 is about 173.9776141545.

The spelling of 5265991 in words is "five million, two hundred sixty-five thousand, nine hundred ninety-one".