13481531 has 4 divisors (see below), whose sum is σ = 15407472. Its totient is φ = 11555592.

The previous prime is 13481477. The next prime is 13481569. The reversal of 13481531 is 13518431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13481531 - 2²² = 9287227 is a prime.

It is a super-2 number, since 2×13481531² = 363503356207922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13481531.

It is not an unprimeable number, because it can be changed into a prime (13481591) 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, 962960 + ... + 962973.

It is an arithmetic number, because the mean of its divisors is an integer number (3851868).

Almost surely, 2^13481531 is an apocalyptic number.

13481531 is a deficient number, since it is larger than the sum of its proper divisors (1925941).

13481531 is an equidigital number, since it uses as much as digits as its factorization.

13481531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1925940.

The product of its digits is 1440, while the sum is 26.

The square root of 13481531 is about 3671.7204414280. The cubic root of 13481531 is about 238.0015241293.

Adding to 13481531 its reverse (13518431), we get a palindrome (26999962).

The spelling of 13481531 in words is "thirteen million, four hundred eighty-one thousand, five hundred thirty-one".