154978849 has 2 divisors, whose sum is σ = 154978850. Its totient is φ = 154978848.

The previous prime is 154978843. The next prime is 154978883. The reversal of 154978849 is 948879451.

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., 153586449 + 1392400 = 12393^2 + 1180^2 .

It is a cyclic number.

It is not a de Polignac number, because 154978849 - 2³ = 154978841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 154978849.

It is not a weakly prime, because it can be changed into another prime (154978841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77489424 + 77489425.

It is an arithmetic number, because the mean of its divisors is an integer number (77489425).

Almost surely, 2^154978849 is an apocalyptic number.

It is an amenable number.

154978849 is a deficient number, since it is larger than the sum of its proper divisors (1).

154978849 is an equidigital number, since it uses as much as digits as its factorization.

154978849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The square root of 154978849 is about 12449.0501244071. The cubic root of 154978849 is about 537.1441007235.

The spelling of 154978849 in words is "one hundred fifty-four million, nine hundred seventy-eight thousand, eight hundred forty-nine".