136681237 has 18 divisors (see below), whose sum is σ = 174772374. Its totient is φ = 106500240.

The previous prime is 136681211. The next prime is 136681253. The reversal of 136681237 is 732186631.

It can be written as a sum of positive squares in only one way, i.e., 128119761 + 8561476 = 11319^2 + 2926^2 .

It is not a de Polignac number, because 136681237 - 2⁷ = 136681109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 136681196 and 136681205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136681267) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5598 + ... + 17455.

Almost surely, 2^136681237 is an apocalyptic number.

It is an amenable number.

136681237 is a deficient number, since it is larger than the sum of its proper divisors (38091137).

136681237 is a wasteful number, since it uses less digits than its factorization.

136681237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23089 (or 23071 counting only the distinct ones).

The product of its digits is 36288, while the sum is 37.

The square root of 136681237 is about 11691.0751002634. The cubic root of 136681237 is about 515.1135414345.

The spelling of 136681237 in words is "one hundred thirty-six million, six hundred eighty-one thousand, two hundred thirty-seven".