7242318991 has 2 divisors, whose sum is σ = 7242318992. Its totient is φ = 7242318990.

The previous prime is 7242318961. The next prime is 7242319009. The reversal of 7242318991 is 1998132427.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7242318991 is a prime.

It is a super-3 number, since 3×7242318991³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7242318961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3621159495 + 3621159496.

It is an arithmetic number, because the mean of its divisors is an integer number (3621159496).

Almost surely, 2^7242318991 is an apocalyptic number.

7242318991 is a deficient number, since it is larger than the sum of its proper divisors (1).

7242318991 is an equidigital number, since it uses as much as digits as its factorization.

7242318991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 7242318991 is about 85101.8154389200. The cubic root of 7242318991 is about 1934.7545790625.

The spelling of 7242318991 in words is "seven billion, two hundred forty-two million, three hundred eighteen thousand, nine hundred ninety-one".