154530421 has 4 divisors (see below), whose sum is σ = 154639692. Its totient is φ = 154421152.

The previous prime is 154530419. The next prime is 154530451. The reversal of 154530421 is 124035451.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 75516100 + 79014321 = 8690^2 + 8889^2 .

It is a cyclic number.

It is not a de Polignac number, because 154530421 - 2¹ = 154530419 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 (154530451) 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, 52486 + ... + 55351.

It is an arithmetic number, because the mean of its divisors is an integer number (38659923).

Almost surely, 2^154530421 is an apocalyptic number.

It is an amenable number.

154530421 is a deficient number, since it is larger than the sum of its proper divisors (109271).

154530421 is a wasteful number, since it uses less digits than its factorization.

154530421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109270.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 154530421 is about 12431.0265465085. The cubic root of 154530421 is about 536.6255285691.

Adding to 154530421 its reverse (124035451), we get a palindrome (278565872).

The spelling of 154530421 in words is "one hundred fifty-four million, five hundred thirty thousand, four hundred twenty-one".