2278793921 has 2 divisors, whose sum is σ = 2278793922. Its totient is φ = 2278793920.

The previous prime is 2278793879. The next prime is 2278794029. The reversal of 2278793921 is 1293978722.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1965680896 + 313113025 = 44336^2 + 17695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278793921 - 2⁶ = 2278793857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2278793921.

It is not a weakly prime, because it can be changed into another prime (2278733921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139396960 + 1139396961.

It is an arithmetic number, because the mean of its divisors is an integer number (1139396961).

Almost surely, 2^2278793921 is an apocalyptic number.

It is an amenable number.

2278793921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278793921 is an equidigital number, since it uses as much as digits as its factorization.

2278793921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 50.

The square root of 2278793921 is about 47736.7146020754. The cubic root of 2278793921 is about 1315.9367555595.

The spelling of 2278793921 in words is "two billion, two hundred seventy-eight million, seven hundred ninety-three thousand, nine hundred twenty-one".