13217973 has 4 divisors (see below), whose sum is σ = 17623968. Its totient is φ = 8811980.

The previous prime is 13217969. The next prime is 13218019. The reversal of 13217973 is 37971231.

It is a happy number.

13217973 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37971231 = 3 ⋅12657077.

It is a cyclic number.

It is not a de Polignac number, because 13217973 - 2² = 13217969 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13217903) 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, 2202993 + ... + 2202998.

It is an arithmetic number, because the mean of its divisors is an integer number (4405992).

Almost surely, 2^13217973 is an apocalyptic number.

It is an amenable number.

13217973 is a deficient number, since it is larger than the sum of its proper divisors (4405995).

13217973 is an equidigital number, since it uses as much as digits as its factorization.

13217973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405994.

The product of its digits is 7938, while the sum is 33.

The square root of 13217973 is about 3635.6530362508. The cubic root of 13217973 is about 236.4403644704.

The spelling of 13217973 in words is "thirteen million, two hundred seventeen thousand, nine hundred seventy-three".