2051173978 has 8 divisors (see below), whose sum is σ = 3516298272. Its totient is φ = 879074556.

The previous prime is 2051173963. The next prime is 2051173987. The reversal of 2051173978 is 8793711502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73256200 + ... + 73256227.

It is an arithmetic number, because the mean of its divisors is an integer number (439537284).

Almost surely, 2^2051173978 is an apocalyptic number.

2051173978 is a deficient number, since it is larger than the sum of its proper divisors (1465124294).

2051173978 is a wasteful number, since it uses less digits than its factorization.

2051173978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146512436.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 2051173978 is about 45289.8882533397. Note that the first 3 decimals coincide. The cubic root of 2051173978 is about 1270.5765415016.

The spelling of 2051173978 in words is "two billion, fifty-one million, one hundred seventy-three thousand, nine hundred seventy-eight".