154872944521 has 3 divisors (see below), whose sum is σ = 154873338061. Its totient is φ = 154872550982.

The previous prime is 154872944497. The next prime is 154872944539. The reversal of 154872944521 is 125449278451.

It is a happy number.

The square root of 154872944521 is 393539.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-154872944521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (154872944561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 196770 + ... + 590308.

Almost surely, 2^154872944521 is an apocalyptic number.

154872944521 is the 393539-th square number.

154872944521 is the 196770-th centered octagonal number.

It is an amenable number.

154872944521 is a deficient number, since it is larger than the sum of its proper divisors (393540).

154872944521 is an frugal number, since it uses more digits than its factorization.

154872944521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787078 (or 393539 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 52.

The spelling of 154872944521 in words is "one hundred fifty-four billion, eight hundred seventy-two million, nine hundred forty-four thousand, five hundred twenty-one".