137443639 has 2 divisors, whose sum is σ = 137443640. Its totient is φ = 137443638.

The previous prime is 137443637. The next prime is 137443643. The reversal of 137443639 is 936344731.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 137443639 - 2¹ = 137443637 is a prime.

Together with 137443637, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137443633) 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, 68721819 + 68721820.

It is an arithmetic number, because the mean of its divisors is an integer number (68721820).

Almost surely, 2^137443639 is an apocalyptic number.

137443639 is a deficient number, since it is larger than the sum of its proper divisors (1).

137443639 is an equidigital number, since it uses as much as digits as its factorization.

137443639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 40.

The square root of 137443639 is about 11723.6359121221. The cubic root of 137443639 is about 516.0695264667.

The spelling of 137443639 in words is "one hundred thirty-seven million, four hundred forty-three thousand, six hundred thirty-nine".