154891487 has 4 divisors (see below), whose sum is σ = 155251296. Its totient is φ = 154531680.

The previous prime is 154891459. The next prime is 154891511. The reversal of 154891487 is 784198451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784198451 = 773 ⋅1014487.

It is a cyclic number.

It is not a de Polignac number, because 154891487 - 2²⁴ = 138114271 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 (154891687) 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, 179258 + ... + 180119.

It is an arithmetic number, because the mean of its divisors is an integer number (38812824).

Almost surely, 2^154891487 is an apocalyptic number.

154891487 is a deficient number, since it is larger than the sum of its proper divisors (359809).

154891487 is an equidigital number, since it uses as much as digits as its factorization.

154891487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359808.

The product of its digits is 322560, while the sum is 47.

The square root of 154891487 is about 12445.5408480307. The cubic root of 154891487 is about 537.0431518877.

The spelling of 154891487 in words is "one hundred fifty-four million, eight hundred ninety-one thousand, four hundred eighty-seven".