154906993 has 2 divisors, whose sum is σ = 154906994. Its totient is φ = 154906992.

The previous prime is 154906991. The next prime is 154907023. The reversal of 154906993 is 399609451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145371249 + 9535744 = 12057^2 + 3088^2 .

It is an emirp because it is prime and its reverse (399609451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154906993 - 2¹ = 154906991 is a prime.

Together with 154906991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (154906991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77453496 + 77453497.

It is an arithmetic number, because the mean of its divisors is an integer number (77453497).

Almost surely, 2^154906993 is an apocalyptic number.

It is an amenable number.

154906993 is a deficient number, since it is larger than the sum of its proper divisors (1).

154906993 is an equidigital number, since it uses as much as digits as its factorization.

154906993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 154906993 is about 12446.1637864846. The cubic root of 154906993 is about 537.0610722038.

The spelling of 154906993 in words is "one hundred fifty-four million, nine hundred six thousand, nine hundred ninety-three".