13777913 has 2 divisors, whose sum is σ = 13777914. Its totient is φ = 13777912.

The previous prime is 13777891. The next prime is 13777921. The reversal of 13777913 is 31977731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10778089 + 2999824 = 3283^2 + 1732^2 .

It is a cyclic number.

It is not a de Polignac number, because 13777913 - 2¹² = 13773817 is a prime.

It is a super-3 number, since 3×13777913³ (a number of 22 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (13777963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6888956 + 6888957.

It is an arithmetic number, because the mean of its divisors is an integer number (6888957).

Almost surely, 2^13777913 is an apocalyptic number.

It is an amenable number.

13777913 is a deficient number, since it is larger than the sum of its proper divisors (1).

13777913 is an equidigital number, since it uses as much as digits as its factorization.

13777913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27783, while the sum is 38.

The square root of 13777913 is about 3711.8611234797. The cubic root of 13777913 is about 239.7329958876.

The spelling of 13777913 in words is "thirteen million, seven hundred seventy-seven thousand, nine hundred thirteen".