154665421 has 4 divisors (see below), whose sum is σ = 154920832. Its totient is φ = 154410012.

The previous prime is 154665419. The next prime is 154665431. The reversal of 154665421 is 124566451.

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.

It is a cyclic number.

It is not a de Polignac number, because 154665421 - 2¹ = 154665419 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 (154665431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126795 + ... + 128008.

It is an arithmetic number, because the mean of its divisors is an integer number (38730208).

Almost surely, 2^154665421 is an apocalyptic number.

It is an amenable number.

154665421 is a deficient number, since it is larger than the sum of its proper divisors (255411).

154665421 is an equidigital number, since it uses as much as digits as its factorization.

154665421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255410.

The product of its digits is 28800, while the sum is 34.

The square root of 154665421 is about 12436.4553229608. The cubic root of 154665421 is about 536.7817510137.

The spelling of 154665421 in words is "one hundred fifty-four million, six hundred sixty-five thousand, four hundred twenty-one".