7831972217 has 2 divisors, whose sum is σ = 7831972218. Its totient is φ = 7831972216.

The previous prime is 7831972193. The next prime is 7831972223. The reversal of 7831972217 is 7122791387.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6197468176 + 1634504041 = 78724^2 + 40429^2 .

It is a cyclic number.

It is not a de Polignac number, because 7831972217 - 2¹⁰ = 7831971193 is a prime.

It is a super-2 number, since 2×7831972217² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7831972517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3915986108 + 3915986109.

It is an arithmetic number, because the mean of its divisors is an integer number (3915986109).

Almost surely, 2^7831972217 is an apocalyptic number.

It is an amenable number.

7831972217 is a deficient number, since it is larger than the sum of its proper divisors (1).

7831972217 is an equidigital number, since it uses as much as digits as its factorization.

7831972217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 296352, while the sum is 47.

The square root of 7831972217 is about 88498.4305906043. The cubic root of 7831972217 is about 1985.8984921651.

The spelling of 7831972217 in words is "seven billion, eight hundred thirty-one million, nine hundred seventy-two thousand, two hundred seventeen".