7265991 has 4 divisors (see below), whose sum is σ = 9687992. Its totient is φ = 4843992.

The previous prime is 7265989. The next prime is 7266001. The reversal of 7265991 is 1995627.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7265991 - 2¹ = 7265989 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 (7265911) 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, 1210996 + ... + 1211001.

It is an arithmetic number, because the mean of its divisors is an integer number (2421998).

Almost surely, 2^7265991 is an apocalyptic number.

7265991 is a deficient number, since it is larger than the sum of its proper divisors (2422001).

7265991 is a wasteful number, since it uses less digits than its factorization.

7265991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2422000.

The product of its digits is 34020, while the sum is 39.

The square root of 7265991 is about 2695.5502221253. The cubic root of 7265991 is about 193.6860245248.

It can be divided in two parts, 7265 and 991, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 7265991 in words is "seven million, two hundred sixty-five thousand, nine hundred ninety-one".