1278131051 has 2 divisors, whose sum is σ = 1278131052. Its totient is φ = 1278131050.

The previous prime is 1278131039. The next prime is 1278131059. The reversal of 1278131051 is 1501318721.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1278131051 - 2²² = 1273936747 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278131059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639065525 + 639065526.

It is an arithmetic number, because the mean of its divisors is an integer number (639065526).

Almost surely, 2^1278131051 is an apocalyptic number.

1278131051 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278131051 is an equidigital number, since it uses as much as digits as its factorization.

1278131051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 1278131051 is about 35750.9587423890. The cubic root of 1278131051 is about 1085.2383404708.

Adding to 1278131051 its reverse (1501318721), we get a palindrome (2779449772).

The spelling of 1278131051 in words is "one billion, two hundred seventy-eight million, one hundred thirty-one thousand, fifty-one".