149978849 has 2 divisors, whose sum is σ = 149978850. Its totient is φ = 149978848.

The previous prime is 149978831. The next prime is 149978863. The reversal of 149978849 is 948879941.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108826624 + 41152225 = 10432^2 + 6415^2 .

It is a cyclic number.

It is not a de Polignac number, because 149978849 - 2¹² = 149974753 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (149978869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 74989424 + 74989425.

It is an arithmetic number, because the mean of its divisors is an integer number (74989425).

Almost surely, 2^149978849 is an apocalyptic number.

It is an amenable number.

149978849 is a deficient number, since it is larger than the sum of its proper divisors (1).

149978849 is an equidigital number, since it uses as much as digits as its factorization.

149978849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5225472, while the sum is 59.

The square root of 149978849 is about 12246.5851975153. The cubic root of 149978849 is about 531.3043097603.

The spelling of 149978849 in words is "one hundred forty-nine million, nine hundred seventy-eight thousand, eight hundred forty-nine".