7912991 has 2 divisors, whose sum is σ = 7912992. Its totient is φ = 7912990.

The previous prime is 7912951. The next prime is 7912999. The reversal of 7912991 is 1992197.

It is a strong prime.

It is an emirp because it is prime and its reverse (1992197) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7912991 - 2¹⁸ = 7650847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7912999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3956495 + 3956496.

It is an arithmetic number, because the mean of its divisors is an integer number (3956496).

Almost surely, 2^7912991 is an apocalyptic number.

7912991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7912991 is an equidigital number, since it uses as much as digits as its factorization.

7912991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 38.

The square root of 7912991 is about 2813.0039104132. The cubic root of 7912991 is about 199.2722803319.

The spelling of 7912991 in words is "seven million, nine hundred twelve thousand, nine hundred ninety-one".