136581831 has 12 divisors (see below), whose sum is σ = 197500680. Its totient is φ = 90954960.

The previous prime is 136581829. The next prime is 136581839. The reversal of 136581831 is 138185631.

It is not a de Polignac number, because 136581831 - 2¹ = 136581829 is a prime.

It is a super-2 number, since 2×136581831² = 37309193118625122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136581839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 925 + ... + 16553.

It is an arithmetic number, because the mean of its divisors is an integer number (16458390).

Almost surely, 2^136581831 is an apocalyptic number.

136581831 is a deficient number, since it is larger than the sum of its proper divisors (60918849).

136581831 is a wasteful number, since it uses less digits than its factorization.

136581831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16606 (or 16603 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 136581831 is about 11686.8229643475. The cubic root of 136581831 is about 514.9886332993.

The spelling of 136581831 in words is "one hundred thirty-six million, five hundred eighty-one thousand, eight hundred thirty-one".