154768921 has 2 divisors, whose sum is σ = 154768922. Its totient is φ = 154768920.

The previous prime is 154768907. The next prime is 154768961. The reversal of 154768921 is 129867451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124077321 + 30691600 = 11139^2 + 5540^2 .

It is a cyclic number.

It is not a de Polignac number, because 154768921 - 2⁷ = 154768793 is a prime.

It is not a weakly prime, because it can be changed into another prime (154768961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77384460 + 77384461.

It is an arithmetic number, because the mean of its divisors is an integer number (77384461).

Almost surely, 2^154768921 is an apocalyptic number.

It is an amenable number.

154768921 is a deficient number, since it is larger than the sum of its proper divisors (1).

154768921 is an equidigital number, since it uses as much as digits as its factorization.

154768921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 43.

The square root of 154768921 is about 12440.6157805794. The cubic root of 154768921 is about 536.9014600020.

The spelling of 154768921 in words is "one hundred fifty-four million, seven hundred sixty-eight thousand, nine hundred twenty-one".