13531121251 has 2 divisors, whose sum is σ = 13531121252. Its totient is φ = 13531121250.

The previous prime is 13531121249. The next prime is 13531121257. The reversal of 13531121251 is 15212113531.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13531121251 - 2¹ = 13531121249 is a prime.

Together with 13531121249, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13531121257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6765560625 + 6765560626.

It is an arithmetic number, because the mean of its divisors is an integer number (6765560626).

Almost surely, 2^13531121251 is an apocalyptic number.

13531121251 is a deficient number, since it is larger than the sum of its proper divisors (1).

13531121251 is an equidigital number, since it uses as much as digits as its factorization.

13531121251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 25.

Adding to 13531121251 its reverse (15212113531), we get a palindrome (28743234782).

The spelling of 13531121251 in words is "thirteen billion, five hundred thirty-one million, one hundred twenty-one thousand, two hundred fifty-one".