13981951 has 2 divisors, whose sum is σ = 13981952. Its totient is φ = 13981950.

The previous prime is 13981937. The next prime is 13981969. The reversal of 13981951 is 15918931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13981951 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13981951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13981901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6990975 + 6990976.

It is an arithmetic number, because the mean of its divisors is an integer number (6990976).

Almost surely, 2^13981951 is an apocalyptic number.

13981951 is a deficient number, since it is larger than the sum of its proper divisors (1).

13981951 is an equidigital number, since it uses as much as digits as its factorization.

13981951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 37.

The square root of 13981951 is about 3739.2447098311. The cubic root of 13981951 is about 240.9106088818.

The spelling of 13981951 in words is "thirteen million, nine hundred eighty-one thousand, nine hundred fifty-one".