2149051778 has 4 divisors (see below), whose sum is σ = 3223577670. Its totient is φ = 1074525888.

The previous prime is 2149051763. The next prime is 2149051823. The reversal of 2149051778 is 8771509412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2121247249 + 27804529 = 46057^2 + 5273^2 .

It is a super-2 number, since 2×2149051778² = 9236847089049922568, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537262943 + ... + 537262946.

Almost surely, 2^2149051778 is an apocalyptic number.

2149051778 is a deficient number, since it is larger than the sum of its proper divisors (1074525892).

2149051778 is a wasteful number, since it uses less digits than its factorization.

2149051778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074525891.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 2149051778 is about 46357.8664090573. The cubic root of 2149051778 is about 1290.4731109222.

The spelling of 2149051778 in words is "two billion, one hundred forty-nine million, fifty-one thousand, seven hundred seventy-eight".