136491887 has 8 divisors (see below), whose sum is σ = 156082176. Its totient is φ = 116924472.

The previous prime is 136491881. The next prime is 136491899. The reversal of 136491887 is 788194631.

136491887 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-136491887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136491881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9938 + ... + 19280.

It is an arithmetic number, because the mean of its divisors is an integer number (19510272).

Almost surely, 2^136491887 is an apocalyptic number.

136491887 is a deficient number, since it is larger than the sum of its proper divisors (19590289).

136491887 is an equidigital number, since it uses as much as digits as its factorization.

136491887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11437.

The product of its digits is 290304, while the sum is 47.

The square root of 136491887 is about 11682.9742360411. The cubic root of 136491887 is about 514.8755623565.

The spelling of 136491887 in words is "one hundred thirty-six million, four hundred ninety-one thousand, eight hundred eighty-seven".