137797817 has 2 divisors, whose sum is σ = 137797818. Its totient is φ = 137797816.

The previous prime is 137797813. The next prime is 137797819. The reversal of 137797817 is 718797731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90174016 + 47623801 = 9496^2 + 6901^2 .

It is a cyclic number.

It is not a de Polignac number, because 137797817 - 2² = 137797813 is a prime.

Together with 137797819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137797811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68898908 + 68898909.

It is an arithmetic number, because the mean of its divisors is an integer number (68898909).

Almost surely, 2^137797817 is an apocalyptic number.

It is an amenable number.

137797817 is a deficient number, since it is larger than the sum of its proper divisors (1).

137797817 is an equidigital number, since it uses as much as digits as its factorization.

137797817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 518616, while the sum is 50.

The square root of 137797817 is about 11738.7314902420. The cubic root of 137797817 is about 516.5124321220.

The spelling of 137797817 in words is "one hundred thirty-seven million, seven hundred ninety-seven thousand, eight hundred seventeen".