154694689 has 2 divisors, whose sum is σ = 154694690. Its totient is φ = 154694688.

The previous prime is 154694677. The next prime is 154694699. The reversal of 154694689 is 986496451.

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., 99341089 + 55353600 = 9967^2 + 7440^2 .

It is a cyclic number.

It is not a de Polignac number, because 154694689 - 2²¹ = 152597537 is a prime.

It is not a weakly prime, because it can be changed into another prime (154694699) 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, 77347344 + 77347345.

It is an arithmetic number, because the mean of its divisors is an integer number (77347345).

Almost surely, 2^154694689 is an apocalyptic number.

It is an amenable number.

154694689 is a deficient number, since it is larger than the sum of its proper divisors (1).

154694689 is an equidigital number, since it uses as much as digits as its factorization.

154694689 is an odious number, because the sum of its binary digits is odd.

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

The square root of 154694689 is about 12437.6319691491. The cubic root of 154694689 is about 536.8156080481.

The spelling of 154694689 in words is "one hundred fifty-four million, six hundred ninety-four thousand, six hundred eighty-nine".