136071991 has 16 divisors (see below), whose sum is σ = 150589440. Its totient is φ = 121927680.

The previous prime is 136071953. The next prime is 136072043. The reversal of 136071991 is 199170631.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136071991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 136071991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136071931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 358840 + ... + 359218.

It is an arithmetic number, because the mean of its divisors is an integer number (9411840).

Almost surely, 2^136071991 is an apocalyptic number.

136071991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

136071991 is a deficient number, since it is larger than the sum of its proper divisors (14517449).

136071991 is a wasteful number, since it uses less digits than its factorization.

136071991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 774.

The product of its (nonzero) digits is 10206, while the sum is 37.

The square root of 136071991 is about 11664.9899699914. The cubic root of 136071991 is about 514.3470418965.

The spelling of 136071991 in words is "one hundred thirty-six million, seventy-one thousand, nine hundred ninety-one".