2117738431 has 2 divisors, whose sum is σ = 2117738432. Its totient is φ = 2117738430.

The previous prime is 2117738429. The next prime is 2117738473. The reversal of 2117738431 is 1348377112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2117738431 - 2¹ = 2117738429 is a prime.

It is a super-2 number, since 2×2117738431² = 8969632124268683522, which contains 22 as substring.

Together with 2117738429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2117738411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058869215 + 1058869216.

It is an arithmetic number, because the mean of its divisors is an integer number (1058869216).

Almost surely, 2^2117738431 is an apocalyptic number.

2117738431 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117738431 is an equidigital number, since it uses as much as digits as its factorization.

2117738431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 2117738431 is about 46018.8921096543. The cubic root of 2117738431 is about 1284.1746896553.

The spelling of 2117738431 in words is "two billion, one hundred seventeen million, seven hundred thirty-eight thousand, four hundred thirty-one".