13750991 has 2 divisors, whose sum is σ = 13750992. Its totient is φ = 13750990.

The previous prime is 13750973. The next prime is 13750993. The reversal of 13750991 is 19905731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13750991 - 2¹⁸ = 13488847 is a prime.

Together with 13750993, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₈₉₄₉₄₁ and since 13750991 and 894941 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13750993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6875495 + 6875496.

It is an arithmetic number, because the mean of its divisors is an integer number (6875496).

Almost surely, 2^13750991 is an apocalyptic number.

13750991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13750991 is an equidigital number, since it uses as much as digits as its factorization.

13750991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8505, while the sum is 35.

The square root of 13750991 is about 3708.2328675530. The cubic root of 13750991 is about 239.5767482265.

It can be divided in two parts, 13750 and 991, that added together give a palindrome (14741).

The spelling of 13750991 in words is "thirteen million, seven hundred fifty thousand, nine hundred ninety-one".