1278902497 has 2 divisors, whose sum is σ = 1278902498. Its totient is φ = 1278902496.

The previous prime is 1278902491. The next prime is 1278902507. The reversal of 1278902497 is 7942098721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115292816 + 163609681 = 33396^2 + 12791^2 .

It is a cyclic number.

It is not a de Polignac number, because 1278902497 - 2¹⁵ = 1278869729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1278902497.

It is not a weakly prime, because it can be changed into another prime (1278902491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639451248 + 639451249.

It is an arithmetic number, because the mean of its divisors is an integer number (639451249).

Almost surely, 2^1278902497 is an apocalyptic number.

It is an amenable number.

1278902497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278902497 is an equidigital number, since it uses as much as digits as its factorization.

1278902497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 1278902497 is about 35761.7462800686. The cubic root of 1278902497 is about 1085.4566369162.

The spelling of 1278902497 in words is "one billion, two hundred seventy-eight million, nine hundred two thousand, four hundred ninety-seven".