13987251 has 12 divisors (see below), whose sum is σ = 20900880. Its totient is φ = 9003120.

The previous prime is 13987241. The next prime is 13987271. The reversal of 13987251 is 15278931.

It is not a de Polignac number, because 13987251 - 2⁵ = 13987219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13987241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26535 + ... + 27056.

It is an arithmetic number, because the mean of its divisors is an integer number (1741740).

Almost surely, 2^13987251 is an apocalyptic number.

13987251 is a deficient number, since it is larger than the sum of its proper divisors (6913629).

13987251 is a wasteful number, since it uses less digits than its factorization.

13987251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53626 (or 53623 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13987251 is about 3739.9533419550. The cubic root of 13987251 is about 240.9410449044.

It can be divided in two parts, 1398 and 7251, that added together give a square (8649 = 93²).

The spelling of 13987251 in words is "thirteen million, nine hundred eighty-seven thousand, two hundred fifty-one".