13531397 has 4 divisors (see below), whose sum is σ = 14761536. Its totient is φ = 12301260.

The previous prime is 13531391. The next prime is 13531409. The reversal of 13531397 is 79313531.

13531397 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13531397 - 2⁶ = 13531333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13531391) 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, 615053 + ... + 615074.

It is an arithmetic number, because the mean of its divisors is an integer number (3690384).

Almost surely, 2^13531397 is an apocalyptic number.

It is an amenable number.

13531397 is a deficient number, since it is larger than the sum of its proper divisors (1230139).

13531397 is a wasteful number, since it uses less digits than its factorization.

13531397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230138.

The product of its digits is 8505, while the sum is 32.

The square root of 13531397 is about 3678.5047233897. The cubic root of 13531397 is about 238.2946061036.

The spelling of 13531397 in words is "thirteen million, five hundred thirty-one thousand, three hundred ninety-seven".