13618973 has 2 divisors, whose sum is σ = 13618974. Its totient is φ = 13618972.

The previous prime is 13618961. The next prime is 13618981. The reversal of 13618973 is 37981631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11539609 + 2079364 = 3397^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 13618973 - 2⁶ = 13618909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13618903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6809486 + 6809487.

It is an arithmetic number, because the mean of its divisors is an integer number (6809487).

Almost surely, 2^13618973 is an apocalyptic number.

It is an amenable number.

13618973 is a deficient number, since it is larger than the sum of its proper divisors (1).

13618973 is an equidigital number, since it uses as much as digits as its factorization.

13618973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 13618973 is about 3690.3892748598. The cubic root of 13618973 is about 238.8075865951.

The spelling of 13618973 in words is "thirteen million, six hundred eighteen thousand, nine hundred seventy-three".