7312991 has 8 divisors (see below), whose sum is σ = 8499840. Its totient is φ = 6161688.

The previous prime is 7312979. The next prime is 7312997. The reversal of 7312991 is 1992137.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7312991 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 (7312997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8441 + ... + 9266.

It is an arithmetic number, because the mean of its divisors is an integer number (1062480).

Almost surely, 2^7312991 is an apocalyptic number.

7312991 is a deficient number, since it is larger than the sum of its proper divisors (1186849).

7312991 is a wasteful number, since it uses less digits than its factorization.

7312991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17773.

The product of its digits is 3402, while the sum is 32.

The square root of 7312991 is about 2704.2542410062. The cubic root of 7312991 is about 194.1027460843.

The spelling of 7312991 in words is "seven million, three hundred twelve thousand, nine hundred ninety-one".