136881919 has 2 divisors, whose sum is σ = 136881920. Its totient is φ = 136881918.

The previous prime is 136881917. The next prime is 136881923. The reversal of 136881919 is 919188631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 136881919 - 2¹ = 136881917 is a prime.

It is a super-2 number, since 2×136881919² = 37473319498245122, which contains 22 as substring.

Together with 136881917, 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 (136881917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68440959 + 68440960.

It is an arithmetic number, because the mean of its divisors is an integer number (68440960).

Almost surely, 2^136881919 is an apocalyptic number.

136881919 is a deficient number, since it is larger than the sum of its proper divisors (1).

136881919 is an equidigital number, since it uses as much as digits as its factorization.

136881919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 46.

The square root of 136881919 is about 11699.6546530229. The cubic root of 136881919 is about 515.3655230191.

The spelling of 136881919 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, nine hundred nineteen".