13955581 has 2 divisors, whose sum is σ = 13955582. Its totient is φ = 13955580.

The previous prime is 13955567. The next prime is 13955593. The reversal of 13955581 is 18555931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7371225 + 6584356 = 2715^2 + 2566^2 .

It is an emirp because it is prime and its reverse (18555931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13955581 is a prime.

It is a super-2 number, since 2×13955581² = 389516482095122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13955581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13955531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6977790 + 6977791.

It is an arithmetic number, because the mean of its divisors is an integer number (6977791).

Almost surely, 2^13955581 is an apocalyptic number.

It is an amenable number.

13955581 is a deficient number, since it is larger than the sum of its proper divisors (1).

13955581 is an equidigital number, since it uses as much as digits as its factorization.

13955581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 37.

The square root of 13955581 is about 3735.7169325312. The cubic root of 13955581 is about 240.7590608669.

The spelling of 13955581 in words is "thirteen million, nine hundred fifty-five thousand, five hundred eighty-one".