154138591 has 2 divisors, whose sum is σ = 154138592. Its totient is φ = 154138590.

The previous prime is 154138549. The next prime is 154138627. The reversal of 154138591 is 195831451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 154138591 - 2⁹ = 154138079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154138591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154138091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77069295 + 77069296.

It is an arithmetic number, because the mean of its divisors is an integer number (77069296).

Almost surely, 2^154138591 is an apocalyptic number.

154138591 is a deficient number, since it is larger than the sum of its proper divisors (1).

154138591 is an equidigital number, since it uses as much as digits as its factorization.

154138591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 37.

The square root of 154138591 is about 12415.2563807599. The cubic root of 154138591 is about 536.1715856965.

The spelling of 154138591 in words is "one hundred fifty-four million, one hundred thirty-eight thousand, five hundred ninety-one".