137209979 has 2 divisors, whose sum is σ = 137209980. Its totient is φ = 137209978.

The previous prime is 137209957. The next prime is 137210063. The reversal of 137209979 is 979902731.

137209979 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 is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137209979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137239979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68604989 + 68604990.

It is an arithmetic number, because the mean of its divisors is an integer number (68604990).

Almost surely, 2^137209979 is an apocalyptic number.

137209979 is a deficient number, since it is larger than the sum of its proper divisors (1).

137209979 is an equidigital number, since it uses as much as digits as its factorization.

137209979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 137209979 is about 11713.6663346708. Note that the first 3 decimals coincide. The cubic root of 137209979 is about 515.7769139114.

The spelling of 137209979 in words is "one hundred thirty-seven million, two hundred nine thousand, nine hundred seventy-nine".