137826391 has 2 divisors, whose sum is σ = 137826392. Its totient is φ = 137826390.

The previous prime is 137826383. The next prime is 137826401. The reversal of 137826391 is 193628731.

It is a weak prime.

It is an emirp because it is prime and its reverse (193628731) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 137826391 - 2³ = 137826383 is a prime.

It is a super-2 number, since 2×137826391² = 37992228112169762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137826371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68913195 + 68913196.

It is an arithmetic number, because the mean of its divisors is an integer number (68913196).

Almost surely, 2^137826391 is an apocalyptic number.

137826391 is a deficient number, since it is larger than the sum of its proper divisors (1).

137826391 is an equidigital number, since it uses as much as digits as its factorization.

137826391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 137826391 is about 11739.9485092568. The cubic root of 137826391 is about 516.5481312996.

The spelling of 137826391 in words is "one hundred thirty-seven million, eight hundred twenty-six thousand, three hundred ninety-one".