154520391 has 4 divisors (see below), whose sum is σ = 206027192. Its totient is φ = 103013592.

The previous prime is 154520357. The next prime is 154520411. The reversal of 154520391 is 193025451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193025451 = 3 ⋅64341817.

It is not a de Polignac number, because 154520391 - 2¹⁵ = 154487623 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 (154520791) 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, 25753396 + ... + 25753401.

It is an arithmetic number, because the mean of its divisors is an integer number (51506798).

Almost surely, 2^154520391 is an apocalyptic number.

154520391 is a deficient number, since it is larger than the sum of its proper divisors (51506801).

154520391 is an equidigital number, since it uses as much as digits as its factorization.

154520391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51506800.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 154520391 is about 12430.6231139070. The cubic root of 154520391 is about 536.6139181896.

The spelling of 154520391 in words is "one hundred fifty-four million, five hundred twenty thousand, three hundred ninety-one".