154249489 has 2 divisors, whose sum is σ = 154249490. Its totient is φ = 154249488.

The previous prime is 154249457. The next prime is 154249507. The reversal of 154249489 is 984942451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154181889 + 67600 = 12417^2 + 260^2 .

It is a cyclic number.

It is not a de Polignac number, because 154249489 - 2⁵ = 154249457 is a prime.

It is a super-2 number, since 2×154249489² = 47585809713522242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (154249889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77124744 + 77124745.

It is an arithmetic number, because the mean of its divisors is an integer number (77124745).

Almost surely, 2^154249489 is an apocalyptic number.

It is an amenable number.

154249489 is a deficient number, since it is larger than the sum of its proper divisors (1).

154249489 is an equidigital number, since it uses as much as digits as its factorization.

154249489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 46.

The square root of 154249489 is about 12419.7217762718. The cubic root of 154249489 is about 536.3001412210.

The spelling of 154249489 in words is "one hundred fifty-four million, two hundred forty-nine thousand, four hundred eighty-nine".