7920740291 has 2 divisors, whose sum is σ = 7920740292. Its totient is φ = 7920740290.

The previous prime is 7920740227. The next prime is 7920740323. The reversal of 7920740291 is 1920470297.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7920740291 - 2⁶ = 7920740227 is a prime.

It is not a weakly prime, because it can be changed into another prime (7920740221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960370145 + 3960370146.

It is an arithmetic number, because the mean of its divisors is an integer number (3960370146).

Almost surely, 2^7920740291 is an apocalyptic number.

7920740291 is a deficient number, since it is larger than the sum of its proper divisors (1).

7920740291 is an equidigital number, since it uses as much as digits as its factorization.

7920740291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 7920740291 is about 88998.5409487144. The cubic root of 7920740291 is about 1993.3730905377.

The spelling of 7920740291 in words is "seven billion, nine hundred twenty million, seven hundred forty thousand, two hundred ninety-one".