154885921 has 4 divisors (see below), whose sum is σ = 154913200. Its totient is φ = 154858644.

The previous prime is 154885919. The next prime is 154885943. The reversal of 154885921 is 129588451.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 129588451 = 829 ⋅156319.

It is a cyclic number.

It is not a de Polignac number, because 154885921 - 2¹ = 154885919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154885421) 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, 1551 + ... + 17668.

It is an arithmetic number, because the mean of its divisors is an integer number (38728300).

Almost surely, 2^154885921 is an apocalyptic number.

It is an amenable number.

154885921 is a deficient number, since it is larger than the sum of its proper divisors (27279).

154885921 is an equidigital number, since it uses as much as digits as its factorization.

154885921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27278.

The product of its digits is 115200, while the sum is 43.

The square root of 154885921 is about 12445.3172317945. The cubic root of 154885921 is about 537.0367189583.

The spelling of 154885921 in words is "one hundred fifty-four million, eight hundred eighty-five thousand, nine hundred twenty-one".