1278973151 has 2 divisors, whose sum is σ = 1278973152. Its totient is φ = 1278973150.

The previous prime is 1278973133. The next prime is 1278973159. The reversal of 1278973151 is 1513798721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1278973151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1278973159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639486575 + 639486576.

It is an arithmetic number, because the mean of its divisors is an integer number (639486576).

Almost surely, 2^1278973151 is an apocalyptic number.

1278973151 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278973151 is an equidigital number, since it uses as much as digits as its factorization.

1278973151 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 44.

The square root of 1278973151 is about 35762.7341096846. The cubic root of 1278973151 is about 1085.4766255239.

The spelling of 1278973151 in words is "one billion, two hundred seventy-eight million, nine hundred seventy-three thousand, one hundred fifty-one".