154391 has 4 divisors (see below), whose sum is σ = 156984. Its totient is φ = 151800.

The previous prime is 154387. The next prime is 154409. The reversal of 154391 is 193451.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 154391 - 2² = 154387 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 (154321) 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, 1205 + ... + 1326.

It is an arithmetic number, because the mean of its divisors is an integer number (39246).

2¹⁵⁴³⁹¹ is an apocalyptic number.

154391 is a deficient number, since it is larger than the sum of its proper divisors (2593).

154391 is an equidigital number, since it uses as much as digits as its factorization.

154391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592.

The product of its digits is 540, while the sum is 23.

The square root of 154391 is about 392.9262017224. The cubic root of 154391 is about 53.6464094596.

Subtracting 154391 from its reverse (193451), we obtain a triangular number (39060 = T₂₇₉).

It can be divided in two parts, 154 and 391, that added together give a palindrome (545).

The spelling of 154391 in words is "one hundred fifty-four thousand, three hundred ninety-one".