13213945 has 4 divisors (see below), whose sum is σ = 15856740. Its totient is φ = 10571152.

The previous prime is 13213939. The next prime is 13213951. The reversal of 13213945 is 54931231.

13213945 is digitally balanced in base 2, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 54931231 = 881 ⋅62351.

It is an interprime number because it is at equal distance from previous prime (13213939) and next prime (13213951).

It can be written as a sum of positive squares in 2 ways, for example, as 7817616 + 5396329 = 2796^2 + 2323^2 .

It is a cyclic number.

It is not a de Polignac number, because 13213945 - 2¹⁹ = 12689657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1321390 + ... + 1321399.

It is an arithmetic number, because the mean of its divisors is an integer number (3964185).

Almost surely, 2^13213945 is an apocalyptic number.

It is an amenable number.

13213945 is a deficient number, since it is larger than the sum of its proper divisors (2642795).

13213945 is an equidigital number, since it uses as much as digits as its factorization.

13213945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642794.

The product of its digits is 3240, while the sum is 28.

The square root of 13213945 is about 3635.0990357898. The cubic root of 13213945 is about 236.4163446870.

The spelling of 13213945 in words is "thirteen million, two hundred thirteen thousand, nine hundred forty-five".