13045781 has 4 divisors (see below), whose sum is σ = 14909472. Its totient is φ = 11182092.

The previous prime is 13045759. The next prime is 13045801. The reversal of 13045781 is 18754031.

13045781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13045781 - 2⁶ = 13045717 is a prime.

It is a super-2 number, since 2×13045781² = 340384803799922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13045751) 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, 931835 + ... + 931848.

It is an arithmetic number, because the mean of its divisors is an integer number (3727368).

Almost surely, 2^13045781 is an apocalyptic number.

It is an amenable number.

13045781 is a deficient number, since it is larger than the sum of its proper divisors (1863691).

13045781 is an equidigital number, since it uses as much as digits as its factorization.

13045781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863690.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 13045781 is about 3611.8943783007. The cubic root of 13045781 is about 235.4091619435.

The spelling of 13045781 in words is "thirteen million, forty-five thousand, seven hundred eighty-one".