154344991 has 2 divisors, whose sum is σ = 154344992. Its totient is φ = 154344990.

The previous prime is 154344959. The next prime is 154345013. The reversal of 154344991 is 199443451.

It is a strong prime.

It is an emirp because it is prime and its reverse (199443451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154344991 - 2⁵ = 154344959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154341991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77172495 + 77172496.

It is an arithmetic number, because the mean of its divisors is an integer number (77172496).

Almost surely, 2^154344991 is an apocalyptic number.

154344991 is a deficient number, since it is larger than the sum of its proper divisors (1).

154344991 is an equidigital number, since it uses as much as digits as its factorization.

154344991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 40.

The square root of 154344991 is about 12423.5659534612. The cubic root of 154344991 is about 536.4107999764.

The spelling of 154344991 in words is "one hundred fifty-four million, three hundred forty-four thousand, nine hundred ninety-one".