2117172493 has 2 divisors, whose sum is σ = 2117172494. Its totient is φ = 2117172492.

The previous prime is 2117172427. The next prime is 2117172511. The reversal of 2117172493 is 3942717112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1777212649 + 339959844 = 42157^2 + 18438^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2117172493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117173493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058586246 + 1058586247.

It is an arithmetic number, because the mean of its divisors is an integer number (1058586247).

Almost surely, 2^2117172493 is an apocalyptic number.

It is an amenable number.

2117172493 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117172493 is an equidigital number, since it uses as much as digits as its factorization.

2117172493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 37.

The square root of 2117172493 is about 46012.7427241628. The cubic root of 2117172493 is about 1284.0602864798.

The spelling of 2117172493 in words is "two billion, one hundred seventeen million, one hundred seventy-two thousand, four hundred ninety-three".