136421091 has 30 divisors (see below), whose sum is σ = 207062460. Its totient is φ = 89506944.

The previous prime is 136421081. The next prime is 136421113. The reversal of 136421091 is 190124631.

136421091 is a `hidden beast` number, since 1 + 3 + 642 + 10 + 9 + 1 = 666.

It is not a de Polignac number, because 136421091 - 2¹¹ = 136419043 is a prime.

It is a super-2 number, since 2×136421091² = 37221428139260562, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (136421011) 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 29 ways as a sum of consecutive naturals, for example, 762040 + ... + 762218.

It is an arithmetic number, because the mean of its divisors is an integer number (6902082).

Almost surely, 2^136421091 is an apocalyptic number.

136421091 is a deficient number, since it is larger than the sum of its proper divisors (70641369).

136421091 is an frugal number, since it uses more digits than its factorization.

136421091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 136421091 is about 11679.9439639067. The cubic root of 136421091 is about 514.7865279210.

The spelling of 136421091 in words is "one hundred thirty-six million, four hundred twenty-one thousand, ninety-one".