1277939051 has 2 divisors, whose sum is σ = 1277939052. Its totient is φ = 1277939050.

The previous prime is 1277938951. The next prime is 1277939053. The reversal of 1277939051 is 1509397721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1277939051 is a prime.

Together with 1277939053, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1277938993 and 1277939011.

It is not a weakly prime, because it can be changed into another prime (1277939053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638969525 + 638969526.

It is an arithmetic number, because the mean of its divisors is an integer number (638969526).

Almost surely, 2^1277939051 is an apocalyptic number.

1277939051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1277939051 is an equidigital number, since it uses as much as digits as its factorization.

1277939051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 44.

The square root of 1277939051 is about 35748.2733988650. The cubic root of 1277939051 is about 1085.1839964880.

The spelling of 1277939051 in words is "one billion, two hundred seventy-seven million, nine hundred thirty-nine thousand, fifty-one".