154139899 has 2 divisors, whose sum is σ = 154139900. Its totient is φ = 154139898.

The previous prime is 154139897. The next prime is 154139903. The reversal of 154139899 is 998931451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 154139899 - 2¹ = 154139897 is a prime.

Together with 154139897, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (154139897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77069949 + 77069950.

It is an arithmetic number, because the mean of its divisors is an integer number (77069950).

Almost surely, 2^154139899 is an apocalyptic number.

154139899 is a deficient number, since it is larger than the sum of its proper divisors (1).

154139899 is an equidigital number, since it uses as much as digits as its factorization.

154139899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 49.

The square root of 154139899 is about 12415.3090577722. The cubic root of 154139899 is about 536.1731023196.

The spelling of 154139899 in words is "one hundred fifty-four million, one hundred thirty-nine thousand, eight hundred ninety-nine".