15981947 has 2 divisors, whose sum is σ = 15981948. Its totient is φ = 15981946.

The previous prime is 15981893. The next prime is 15981949. The reversal of 15981947 is 74918951.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 15981947 - 2⁶ = 15981883 is a prime.

Together with 15981949, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 15981898 and 15981907.

It is not a weakly prime, because it can be changed into another prime (15981949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7990973 + 7990974.

It is an arithmetic number, because the mean of its divisors is an integer number (7990974).

Almost surely, 2^15981947 is an apocalyptic number.

15981947 is a deficient number, since it is larger than the sum of its proper divisors (1).

15981947 is an equidigital number, since it uses as much as digits as its factorization.

15981947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 44.

The square root of 15981947 is about 3997.7427380961. The cubic root of 15981947 is about 251.8894020010.

The spelling of 15981947 in words is "fifteen million, nine hundred eighty-one thousand, nine hundred forty-seven".