2278747621 has 2 divisors, whose sum is σ = 2278747622. Its totient is φ = 2278747620.

The previous prime is 2278747573. The next prime is 2278747657. The reversal of 2278747621 is 1267478722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1867104100 + 411643521 = 43210^2 + 20289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2278747621 - 2⁹ = 2278747109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2278747421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1139373810 + 1139373811.

It is an arithmetic number, because the mean of its divisors is an integer number (1139373811).

Almost surely, 2^2278747621 is an apocalyptic number.

It is an amenable number.

2278747621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2278747621 is an equidigital number, since it uses as much as digits as its factorization.

2278747621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 526848, while the sum is 46.

The square root of 2278747621 is about 47736.2296479309. The cubic root of 2278747621 is about 1315.9278432011.

The spelling of 2278747621 in words is "two billion, two hundred seventy-eight million, seven hundred forty-seven thousand, six hundred twenty-one".