7997072091 has 4 divisors (see below), whose sum is σ = 10662762792. Its totient is φ = 5331381392.

The previous prime is 7997072081. The next prime is 7997072107. The reversal of 7997072091 is 1902707997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1902707997 = 3 ⋅634235999.

It is a cyclic number.

It is not a de Polignac number, because 7997072091 - 2⁵ = 7997072059 is a prime.

It is a super-2 number, since 2×7997072091² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7997072081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1332845346 + ... + 1332845351.

It is an arithmetic number, because the mean of its divisors is an integer number (2665690698).

Almost surely, 2^7997072091 is an apocalyptic number.

7997072091 is a deficient number, since it is larger than the sum of its proper divisors (2665690701).

7997072091 is a wasteful number, since it uses less digits than its factorization.

7997072091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2665690700.

The product of its (nonzero) digits is 500094, while the sum is 51.

The square root of 7997072091 is about 89426.3500932471. The cubic root of 7997072091 is about 1999.7559778111.

The spelling of 7997072091 in words is "seven billion, nine hundred ninety-seven million, seventy-two thousand, ninety-one".