154336421 has 4 divisors (see below), whose sum is σ = 163415052. Its totient is φ = 145257792.

The previous prime is 154336379. The next prime is 154336433. The reversal of 154336421 is 124633451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124633451 = 4759 ⋅26189.

It can be written as a sum of positive squares in 2 ways, for example, as 65788321 + 88548100 = 8111^2 + 9410^2 .

It is not a de Polignac number, because 154336421 - 2²⁶ = 87227557 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 (154336451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4539290 + ... + 4539323.

It is an arithmetic number, because the mean of its divisors is an integer number (40853763).

Almost surely, 2^154336421 is an apocalyptic number.

It is an amenable number.

154336421 is a deficient number, since it is larger than the sum of its proper divisors (9078631).

154336421 is an equidigital number, since it uses as much as digits as its factorization.

154336421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9078630.

The product of its digits is 8640, while the sum is 29.

The square root of 154336421 is about 12423.2210396499. The cubic root of 154336421 is about 536.4008717292.

Adding to 154336421 its reverse (124633451), we get a palindrome (278969872).

The spelling of 154336421 in words is "one hundred fifty-four million, three hundred thirty-six thousand, four hundred twenty-one".