13138949 has 2 divisors, whose sum is σ = 13138950. Its totient is φ = 13138948.

The previous prime is 13138933. The next prime is 13138997. The reversal of 13138949 is 94983131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11950849 + 1188100 = 3457^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 13138949 - 2⁴ = 13138933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13138919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569474 + 6569475.

It is an arithmetic number, because the mean of its divisors is an integer number (6569475).

Almost surely, 2^13138949 is an apocalyptic number.

It is an amenable number.

13138949 is a deficient number, since it is larger than the sum of its proper divisors (1).

13138949 is an equidigital number, since it uses as much as digits as its factorization.

13138949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 38.

The square root of 13138949 is about 3624.7688202146. The cubic root of 13138949 is about 235.9682340180.

The spelling of 13138949 in words is "thirteen million, one hundred thirty-eight thousand, nine hundred forty-nine".