137639893 has 2 divisors, whose sum is σ = 137639894. Its totient is φ = 137639892.

The previous prime is 137639891. The next prime is 137639903. The reversal of 137639893 is 398936731.

137639893 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93257649 + 44382244 = 9657^2 + 6662^2 .

It is a cyclic number.

It is not a de Polignac number, because 137639893 - 2¹ = 137639891 is a prime.

Together with 137639891, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137639891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68819946 + 68819947.

It is an arithmetic number, because the mean of its divisors is an integer number (68819947).

Almost surely, 2^137639893 is an apocalyptic number.

It is an amenable number.

137639893 is a deficient number, since it is larger than the sum of its proper divisors (1).

137639893 is an equidigital number, since it uses as much as digits as its factorization.

137639893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 137639893 is about 11732.0029406747. The cubic root of 137639893 is about 516.3150393232.

The spelling of 137639893 in words is "one hundred thirty-seven million, six hundred thirty-nine thousand, eight hundred ninety-three".