393117839971 has 2 divisors, whose sum is σ = 393117839972. Its totient is φ = 393117839970.

The previous prime is 393117839969. The next prime is 393117840013. The reversal of 393117839971 is 179938711393.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393117839971 - 2¹ = 393117839969 is a prime.

It is a super-2 number, since 2×393117839971² (a number of 24 digits) contains 22 as substring.

Together with 393117839969, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (393117839071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196558919985 + 196558919986.

It is an arithmetic number, because the mean of its divisors is an integer number (196558919986).

Almost surely, 2^393117839971 is an apocalyptic number.

393117839971 is a deficient number, since it is larger than the sum of its proper divisors (1).

393117839971 is an equidigital number, since it uses as much as digits as its factorization.

393117839971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7715736, while the sum is 61.

The spelling of 393117839971 in words is "three hundred ninety-three billion, one hundred seventeen million, eight hundred thirty-nine thousand, nine hundred seventy-one".