13057781 has 8 divisors (see below), whose sum is σ = 14630304. Its totient is φ = 11549520.

The previous prime is 13057777. The next prime is 13057829. The reversal of 13057781 is 18775031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13057781 - 2² = 13057777 is a prime.

It is a super-2 number, since 2×13057781² = 341011289287922, 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 (13057711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15635 + ... + 16448.

It is an arithmetic number, because the mean of its divisors is an integer number (1828788).

Almost surely, 2^13057781 is an apocalyptic number.

13057781 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13057781 is a deficient number, since it is larger than the sum of its proper divisors (1572523).

13057781 is a wasteful number, since it uses less digits than its factorization.

13057781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32131.

The product of its (nonzero) digits is 5880, while the sum is 32.

The square root of 13057781 is about 3613.5551746168. Note that the first 3 decimals coincide. The cubic root of 13057781 is about 235.4813192239.

The spelling of 13057781 in words is "thirteen million, fifty-seven thousand, seven hundred eighty-one".