154466989 has 2 divisors, whose sum is σ = 154466990. Its totient is φ = 154466988.

The previous prime is 154466969. The next prime is 154467007. The reversal of 154466989 is 989664451.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145998889 + 8468100 = 12083^2 + 2910^2 .

It is an emirp because it is prime and its reverse (989664451) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 154466989 - 2²¹ = 152369837 is a prime.

It is a super-2 number, since 2×154466989² = 47720101381452242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154466909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77233494 + 77233495.

It is an arithmetic number, because the mean of its divisors is an integer number (77233495).

Almost surely, 2^154466989 is an apocalyptic number.

It is an amenable number.

154466989 is a deficient number, since it is larger than the sum of its proper divisors (1).

154466989 is an equidigital number, since it uses as much as digits as its factorization.

154466989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 52.

The square root of 154466989 is about 12428.4749265547. The cubic root of 154466989 is about 536.5520934296.

The spelling of 154466989 in words is "one hundred fifty-four million, four hundred sixty-six thousand, nine hundred eighty-nine".