154139771 has 2 divisors, whose sum is σ = 154139772. Its totient is φ = 154139770.

The previous prime is 154139717. The next prime is 154139779. The reversal of 154139771 is 177931451.

Together with previous prime (154139717) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (177931451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154139771 - 2⁶ = 154139707 is a prime.

It is not a weakly prime, because it can be changed into another prime (154139779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77069885 + 77069886.

It is an arithmetic number, because the mean of its divisors is an integer number (77069886).

Almost surely, 2^154139771 is an apocalyptic number.

154139771 is a deficient number, since it is larger than the sum of its proper divisors (1).

154139771 is an equidigital number, since it uses as much as digits as its factorization.

154139771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 38.

The square root of 154139771 is about 12415.3039028451. The cubic root of 154139771 is about 536.1729539043.

The spelling of 154139771 in words is "one hundred fifty-four million, one hundred thirty-nine thousand, seven hundred seventy-one".