278062021 has 2 divisors, whose sum is σ = 278062022. Its totient is φ = 278062020.

The previous prime is 278061977. The next prime is 278062049. The reversal of 278062021 is 120260872.

It is an a-pointer prime, because the next prime (278062049) can be obtained adding 278062021 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159012100 + 119049921 = 12610^2 + 10911^2 .

It is a cyclic number.

It is not a de Polignac number, because 278062021 - 2²¹ = 275964869 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (278062721) by changing a digit.

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, 139031010 + 139031011.

It is an arithmetic number, because the mean of its divisors is an integer number (139031011).

Almost surely, 2^278062021 is an apocalyptic number.

It is an amenable number.

278062021 is a deficient number, since it is larger than the sum of its proper divisors (1).

278062021 is an equidigital number, since it uses as much as digits as its factorization.

278062021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 278062021 is about 16675.1917830051. The cubic root of 278062021 is about 652.7004192448.

The spelling of 278062021 in words is "two hundred seventy-eight million, sixty-two thousand, twenty-one".