136371881 has 2 divisors, whose sum is σ = 136371882. Its totient is φ = 136371880.

The previous prime is 136371827. The next prime is 136371889. The reversal of 136371881 is 188173631.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124121881 + 12250000 = 11141^2 + 3500^2 .

It is an emirp because it is prime and its reverse (188173631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 136371881 - 2⁶ = 136371817 is a prime.

It is a super-2 number, since 2×136371881² = 37194579854956322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (136371889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68185940 + 68185941.

It is an arithmetic number, because the mean of its divisors is an integer number (68185941).

Almost surely, 2^136371881 is an apocalyptic number.

It is an amenable number.

136371881 is a deficient number, since it is larger than the sum of its proper divisors (1).

136371881 is an equidigital number, since it uses as much as digits as its factorization.

136371881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 136371881 is about 11677.8371713259. The cubic root of 136371881 is about 514.7246223133.

The spelling of 136371881 in words is "one hundred thirty-six million, three hundred seventy-one thousand, eight hundred eighty-one".