154401649 has 2 divisors, whose sum is σ = 154401650. Its totient is φ = 154401648.

The previous prime is 154401631. The next prime is 154401673. The reversal of 154401649 is 946104451.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 145443600 + 8958049 = 12060^2 + 2993^2 .

It is a cyclic number.

It is not a de Polignac number, because 154401649 - 2⁷ = 154401521 is a prime.

It is not a weakly prime, because it can be changed into another prime (152401649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77200824 + 77200825.

It is an arithmetic number, because the mean of its divisors is an integer number (77200825).

Almost surely, 2^154401649 is an apocalyptic number.

It is an amenable number.

154401649 is a deficient number, since it is larger than the sum of its proper divisors (1).

154401649 is an equidigital number, since it uses as much as digits as its factorization.

154401649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 154401649 is about 12425.8460074154. The cubic root of 154401649 is about 536.4764283777.

The spelling of 154401649 in words is "one hundred fifty-four million, four hundred one thousand, six hundred forty-nine".