154531381 has 4 divisors (see below), whose sum is σ = 154578700. Its totient is φ = 154484064.

The previous prime is 154531339. The next prime is 154531393. The reversal of 154531381 is 183135451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 183135451 = 467 ⋅392153.

It can be written as a sum of positive squares in 2 ways, for example, as 70056900 + 84474481 = 8370^2 + 9191^2 .

It is a cyclic number.

It is not a de Polignac number, because 154531381 - 2⁹ = 154530869 is a prime.

It is a super-2 number, since 2×154531381² = 47759895427534322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (154531081) 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, 18366 + ... + 25423.

It is an arithmetic number, because the mean of its divisors is an integer number (38644675).

Almost surely, 2^154531381 is an apocalyptic number.

It is an amenable number.

154531381 is a deficient number, since it is larger than the sum of its proper divisors (47319).

154531381 is an equidigital number, since it uses as much as digits as its factorization.

154531381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47318.

The product of its digits is 7200, while the sum is 31.

The square root of 154531381 is about 12431.0651595107. The cubic root of 154531381 is about 536.6266398054.

The spelling of 154531381 in words is "one hundred fifty-four million, five hundred thirty-one thousand, three hundred eighty-one".