154865921 has 12 divisors (see below), whose sum is σ = 180370800. Its totient is φ = 132579720.

The previous prime is 154865917. The next prime is 154865927. The reversal of 154865921 is 129568451.

It is not a de Polignac number, because 154865921 - 2² = 154865917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (154865927) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56030 + ... + 58728.

It is an arithmetic number, because the mean of its divisors is an integer number (15030900).

Almost surely, 2^154865921 is an apocalyptic number.

It is an amenable number.

154865921 is a deficient number, since it is larger than the sum of its proper divisors (25504879).

154865921 is a wasteful number, since it uses less digits than its factorization.

154865921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884 (or 3877 counting only the distinct ones).

The product of its digits is 86400, while the sum is 41.

The square root of 154865921 is about 12444.5136907796. The cubic root of 154865921 is about 537.0136025970.

The spelling of 154865921 in words is "one hundred fifty-four million, eight hundred sixty-five thousand, nine hundred twenty-one".