154541993 has 2 divisors, whose sum is σ = 154541994. Its totient is φ = 154541992.

The previous prime is 154541987. The next prime is 154542013. The reversal of 154541993 is 399145451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107578384 + 46963609 = 10372^2 + 6853^2 .

It is an emirp because it is prime and its reverse (399145451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154541993 - 2⁶ = 154541929 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154541993.

It is not a weakly prime, because it can be changed into another prime (154541903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77270996 + 77270997.

It is an arithmetic number, because the mean of its divisors is an integer number (77270997).

Almost surely, 2^154541993 is an apocalyptic number.

It is an amenable number.

154541993 is a deficient number, since it is larger than the sum of its proper divisors (1).

154541993 is an equidigital number, since it uses as much as digits as its factorization.

154541993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 41.

The square root of 154541993 is about 12431.4919860812. The cubic root of 154541993 is about 536.6389232901.

The spelling of 154541993 in words is "one hundred fifty-four million, five hundred forty-one thousand, nine hundred ninety-three".