137491 has 2 divisors, whose sum is σ = 137492. Its totient is φ = 137490.

The previous prime is 137483. The next prime is 137507. The reversal of 137491 is 194731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137491 - 2³ = 137483 is a prime.

137491 is a lucky number.

It is a nialpdrome in base 11.

It is not a weakly prime, because it can be changed into another prime (137191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68745 + 68746.

It is an arithmetic number, because the mean of its divisors is an integer number (68746).

2¹³⁷⁴⁹¹ is an apocalyptic number.

137491 is a deficient number, since it is larger than the sum of its proper divisors (1).

137491 is an equidigital number, since it uses as much as digits as its factorization.

137491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 756, while the sum is 25.

The square root of 137491 is about 370.7977885587. The cubic root of 137491 is about 51.6128796245.

The spelling of 137491 in words is "one hundred thirty-seven thousand, four hundred ninety-one".