136531421 has 8 divisors (see below), whose sum is σ = 147251160. Its totient is φ = 125842752.

The previous prime is 136531411. The next prime is 136531433. The reversal of 136531421 is 124135631.

136531421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1716100 + 134815321 = 1310^2 + 11611^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 136531421 - 2⁶ = 136531357 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136531411) 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, 1811 + ... + 16623.

It is an arithmetic number, because the mean of its divisors is an integer number (18406395).

Almost surely, 2^136531421 is an apocalyptic number.

It is an amenable number.

136531421 is a deficient number, since it is larger than the sum of its proper divisors (10719739).

136531421 is a wasteful number, since it uses less digits than its factorization.

136531421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15535.

The product of its digits is 2160, while the sum is 26.

The square root of 136531421 is about 11684.6660628364. Note that the first 3 decimals coincide. The cubic root of 136531421 is about 514.9252676931.

The spelling of 136531421 in words is "one hundred thirty-six million, five hundred thirty-one thousand, four hundred twenty-one".