13921951 has 4 divisors (see below), whose sum is σ = 13956400. Its totient is φ = 13887504.

The previous prime is 13921949. The next prime is 13921961. The reversal of 13921951 is 15912931.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15912931 = 47 ⋅338573.

It is a cyclic number.

It is not a de Polignac number, because 13921951 - 2¹ = 13921949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13921961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16611 + ... + 17428.

It is an arithmetic number, because the mean of its divisors is an integer number (3489100).

Almost surely, 2^13921951 is an apocalyptic number.

13921951 is a deficient number, since it is larger than the sum of its proper divisors (34449).

13921951 is an equidigital number, since it uses as much as digits as its factorization.

13921951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34448.

The product of its digits is 2430, while the sum is 31.

The square root of 13921951 is about 3731.2130735191. The cubic root of 13921951 is about 240.5655124999.

The spelling of 13921951 in words is "thirteen million, nine hundred twenty-one thousand, nine hundred fifty-one".