13161947 has 4 divisors (see below), whose sum is σ = 13185336. Its totient is φ = 13138560.

The previous prime is 13161931. The next prime is 13161971. The reversal of 13161947 is 74916131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74916131 = 353 ⋅212227.

It is a cyclic number.

It is not a de Polignac number, because 13161947 - 2⁴ = 13161931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13161917) 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, 10829 + ... + 11982.

It is an arithmetic number, because the mean of its divisors is an integer number (3296334).

Almost surely, 2^13161947 is an apocalyptic number.

13161947 is a deficient number, since it is larger than the sum of its proper divisors (23389).

13161947 is an equidigital number, since it uses as much as digits as its factorization.

13161947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23388.

The product of its digits is 4536, while the sum is 32.

The square root of 13161947 is about 3627.9397734803. The cubic root of 13161947 is about 236.1058308741.

The spelling of 13161947 in words is "thirteen million, one hundred sixty-one thousand, nine hundred forty-seven".