137821379 has 2 divisors, whose sum is σ = 137821380. Its totient is φ = 137821378.

The previous prime is 137821361. The next prime is 137821391. The reversal of 137821379 is 973128731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 137821379 - 2¹⁶ = 137755843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (137821309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68910689 + 68910690.

It is an arithmetic number, because the mean of its divisors is an integer number (68910690).

Almost surely, 2^137821379 is an apocalyptic number.

137821379 is a deficient number, since it is larger than the sum of its proper divisors (1).

137821379 is an equidigital number, since it uses as much as digits as its factorization.

137821379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 41.

The square root of 137821379 is about 11739.7350481176. The cubic root of 137821379 is about 516.5418698703.

The spelling of 137821379 in words is "one hundred thirty-seven million, eight hundred twenty-one thousand, three hundred seventy-nine".