1277855993 has 2 divisors, whose sum is σ = 1277855994. Its totient is φ = 1277855992.

The previous prime is 1277855951. The next prime is 1277856031. The reversal of 1277855993 is 3995587721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 985206544 + 292649449 = 31388^2 + 17107^2 .

It is a cyclic number.

It is not a de Polignac number, because 1277855993 - 2¹⁴ = 1277839609 is a prime.

It is not a weakly prime, because it can be changed into another prime (1277855893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638927996 + 638927997.

It is an arithmetic number, because the mean of its divisors is an integer number (638927997).

Almost surely, 2^1277855993 is an apocalyptic number.

It is an amenable number.

1277855993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277855993 is an equidigital number, since it uses as much as digits as its factorization.

1277855993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4762800, while the sum is 56.

The square root of 1277855993 is about 35747.1116735325. Note that the first 3 decimals coincide. The cubic root of 1277855993 is about 1085.1604859340.

The spelling of 1277855993 in words is "one billion, two hundred seventy-seven million, eight hundred fifty-five thousand, nine hundred ninety-three".