13531257 has 6 divisors (see below), whose sum is σ = 19545162. Its totient is φ = 9020832.

The previous prime is 13531229. The next prime is 13531277. The reversal of 13531257 is 75213531.

It can be written as a sum of positive squares in only one way, i.e., 13461561 + 69696 = 3669^2 + 264^2 .

It is not a de Polignac number, because 13531257 - 2⁷ = 13531129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13531257.

It is not an unprimeable number, because it can be changed into a prime (13531277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 751728 + ... + 751745.

It is an arithmetic number, because the mean of its divisors is an integer number (3257527).

Almost surely, 2^13531257 is an apocalyptic number.

It is an amenable number.

13531257 is a deficient number, since it is larger than the sum of its proper divisors (6013905).

13531257 is a wasteful number, since it uses less digits than its factorization.

13531257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1503479 (or 1503476 counting only the distinct ones).

The product of its digits is 3150, while the sum is 27.

The square root of 13531257 is about 3678.4856938691. The cubic root of 13531257 is about 238.2937842777.

Adding to 13531257 its reverse (75213531), we get a palindrome (88744788).

The spelling of 13531257 in words is "thirteen million, five hundred thirty-one thousand, two hundred fifty-seven".