13491851 has 4 divisors (see below), whose sum is σ = 13927104. Its totient is φ = 13056600.

The previous prime is 13491833. The next prime is 13491853. The reversal of 13491851 is 15819431.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13491851 - 2¹⁸ = 13229707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13491853) 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, 217580 + ... + 217641.

It is an arithmetic number, because the mean of its divisors is an integer number (3481776).

Almost surely, 2^13491851 is an apocalyptic number.

13491851 is a deficient number, since it is larger than the sum of its proper divisors (435253).

13491851 is an equidigital number, since it uses as much as digits as its factorization.

13491851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435252.

The product of its digits is 4320, while the sum is 32.

The square root of 13491851 is about 3673.1255083376. The cubic root of 13491851 is about 238.0622380366.

The spelling of 13491851 in words is "thirteen million, four hundred ninety-one thousand, eight hundred fifty-one".