13917971 has 2 divisors, whose sum is σ = 13917972. Its totient is φ = 13917970.

The previous prime is 13917949. The next prime is 13917989. The reversal of 13917971 is 17971931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13917971 - 2⁶ = 13917907 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13916971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6958985 + 6958986.

It is an arithmetic number, because the mean of its divisors is an integer number (6958986).

Almost surely, 2^13917971 is an apocalyptic number.

13917971 is a deficient number, since it is larger than the sum of its proper divisors (1).

13917971 is an equidigital number, since it uses as much as digits as its factorization.

13917971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11907, while the sum is 38.

The square root of 13917971 is about 3730.6796967845. The cubic root of 13917971 is about 240.5425860678.

The spelling of 13917971 in words is "thirteen million, nine hundred seventeen thousand, nine hundred seventy-one".