137813987 has 2 divisors, whose sum is σ = 137813988. Its totient is φ = 137813986.

The previous prime is 137813983. The next prime is 137813989. The reversal of 137813987 is 789318731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137813987 - 2² = 137813983 is a prime.

Together with 137813989, 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 (137813983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68906993 + 68906994.

It is an arithmetic number, because the mean of its divisors is an integer number (68906994).

Almost surely, 2^137813987 is an apocalyptic number.

137813987 is a deficient number, since it is larger than the sum of its proper divisors (1).

137813987 is an equidigital number, since it uses as much as digits as its factorization.

137813987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 47.

The square root of 137813987 is about 11739.4202156665. The cubic root of 137813987 is about 516.5326348595.

The spelling of 137813987 in words is "one hundred thirty-seven million, eight hundred thirteen thousand, nine hundred eighty-seven".