154027721 has 2 divisors, whose sum is σ = 154027722. Its totient is φ = 154027720.

The previous prime is 154027717. The next prime is 154027751. The reversal of 154027721 is 127720451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144961600 + 9066121 = 12040^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 154027721 - 2² = 154027717 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (154027751) 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, 77013860 + 77013861.

It is an arithmetic number, because the mean of its divisors is an integer number (77013861).

Almost surely, 2^154027721 is an apocalyptic number.

It is an amenable number.

154027721 is a deficient number, since it is larger than the sum of its proper divisors (1).

154027721 is an equidigital number, since it uses as much as digits as its factorization.

154027721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3920, while the sum is 29.

The square root of 154027721 is about 12410.7905066519. The cubic root of 154027721 is about 536.0430009776.

The spelling of 154027721 in words is "one hundred fifty-four million, twenty-seven thousand, seven hundred twenty-one".