137670991 has 2 divisors, whose sum is σ = 137670992. Its totient is φ = 137670990.

The previous prime is 137670983. The next prime is 137671003. The reversal of 137670991 is 199076731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137670991 - 2³ = 137670983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137671991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68835495 + 68835496.

It is an arithmetic number, because the mean of its divisors is an integer number (68835496).

Almost surely, 2^137670991 is an apocalyptic number.

137670991 is a deficient number, since it is larger than the sum of its proper divisors (1).

137670991 is an equidigital number, since it uses as much as digits as its factorization.

137670991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 137670991 is about 11733.3282149610. The cubic root of 137670991 is about 516.3539213547.

The spelling of 137670991 in words is "one hundred thirty-seven million, six hundred seventy thousand, nine hundred ninety-one".