7991297 has 4 divisors (see below), whose sum is σ = 8207316. Its totient is φ = 7775280.

The previous prime is 7991257. The next prime is 7991303. The reversal of 7991297 is 7921997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7921997 = 983 ⋅8059.

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 1560001 = 2536^2 + 1249^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991297 - 2⁶ = 7991233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7991257) 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, 107954 + ... + 108027.

It is an arithmetic number, because the mean of its divisors is an integer number (2051829).

It is a Proth number, since it is equal to 1951 ⋅ 2¹² + 1 and 1951 < 2¹².

Almost surely, 2^7991297 is an apocalyptic number.

It is an amenable number.

7991297 is a deficient number, since it is larger than the sum of its proper divisors (216019).

7991297 is a wasteful number, since it uses less digits than its factorization.

7991297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216018.

The product of its digits is 71442, while the sum is 44.

The square root of 7991297 is about 2826.8882185187. Note that the first 3 decimals coincide. The cubic root of 7991297 is about 199.9274486847.

The spelling of 7991297 in words is "seven million, nine hundred ninety-one thousand, two hundred ninety-seven".