154291987 has 2 divisors, whose sum is σ = 154291988. Its totient is φ = 154291986.

The previous prime is 154291927. The next prime is 154291999. The reversal of 154291987 is 789192451.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 154291987 - 2⁷ = 154291859 is a prime.

It is not a weakly prime, because it can be changed into another prime (154291927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77145993 + 77145994.

It is an arithmetic number, because the mean of its divisors is an integer number (77145994).

Almost surely, 2^154291987 is an apocalyptic number.

154291987 is a deficient number, since it is larger than the sum of its proper divisors (1).

154291987 is an equidigital number, since it uses as much as digits as its factorization.

154291987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 154291987 is about 12421.4325663347. The cubic root of 154291987 is about 536.3493895539.

The spelling of 154291987 in words is "one hundred fifty-four million, two hundred ninety-one thousand, nine hundred eighty-seven".