13491811 has 2 divisors, whose sum is σ = 13491812. Its totient is φ = 13491810.

The previous prime is 13491743. The next prime is 13491817. The reversal of 13491811 is 11819431.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13491811 - 2¹³ = 13483619 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13491811.

It is not a weakly prime, because it can be changed into another prime (13491817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6745905 + 6745906.

It is an arithmetic number, because the mean of its divisors is an integer number (6745906).

Almost surely, 2^13491811 is an apocalyptic number.

13491811 is a deficient number, since it is larger than the sum of its proper divisors (1).

13491811 is an equidigital number, since it uses as much as digits as its factorization.

13491811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 28.

The square root of 13491811 is about 3673.1200633794. The cubic root of 13491811 is about 238.0620027711.

It can be divided in two parts, 1349 and 1811, that added together give a triangular number (3160 = T₇₉).

The spelling of 13491811 in words is "thirteen million, four hundred ninety-one thousand, eight hundred eleven".