7285991 has 4 divisors (see below), whose sum is σ = 7303800. Its totient is φ = 7268184.

The previous prime is 7285981. The next prime is 7285997. The reversal of 7285991 is 1995827.

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

It is a cyclic number.

It is not a de Polignac number, because 7285991 - 2¹⁸ = 7023847 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 (7285997) 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, 8276 + ... + 9113.

It is an arithmetic number, because the mean of its divisors is an integer number (1825950).

Almost surely, 2^7285991 is an apocalyptic number.

7285991 is a deficient number, since it is larger than the sum of its proper divisors (17809).

7285991 is a wasteful number, since it uses less digits than its factorization.

7285991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17808.

The product of its digits is 45360, while the sum is 41.

The square root of 7285991 is about 2699.2574904962. The cubic root of 7285991 is about 193.8635718459.

The spelling of 7285991 in words is "seven million, two hundred eighty-five thousand, nine hundred ninety-one".