13809557 has 2 divisors, whose sum is σ = 13809558. Its totient is φ = 13809556.

The previous prime is 13809553. The next prime is 13809569. The reversal of 13809557 is 75590831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10297681 + 3511876 = 3209^2 + 1874^2 .

It is a cyclic number.

It is not a de Polignac number, because 13809557 - 2² = 13809553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13809557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13809553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6904778 + 6904779.

It is an arithmetic number, because the mean of its divisors is an integer number (6904779).

Almost surely, 2^13809557 is an apocalyptic number.

It is an amenable number.

13809557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13809557 is an equidigital number, since it uses as much as digits as its factorization.

13809557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 13809557 is about 3716.1212305306. The cubic root of 13809557 is about 239.9163886989.

The spelling of 13809557 in words is "thirteen million, eight hundred nine thousand, five hundred fifty-seven".