13131947 has 4 divisors (see below), whose sum is σ = 13316976. Its totient is φ = 12946920.

The previous prime is 13131917. The next prime is 13131959. The reversal of 13131947 is 74913131.

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: 74913131 = 1327 ⋅56453.

It is a cyclic number.

It is not a de Polignac number, because 13131947 - 2⁶ = 13131883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13131917) 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, 92408 + ... + 92549.

It is an arithmetic number, because the mean of its divisors is an integer number (3329244).

Almost surely, 2^13131947 is an apocalyptic number.

13131947 is a deficient number, since it is larger than the sum of its proper divisors (185029).

13131947 is an equidigital number, since it uses as much as digits as its factorization.

13131947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185028.

The product of its digits is 2268, while the sum is 29.

The square root of 13131947 is about 3623.8028368000. The cubic root of 13131947 is about 235.9263092246.

The spelling of 13131947 in words is "thirteen million, one hundred thirty-one thousand, nine hundred forty-seven".