1428124777 has 2 divisors, whose sum is σ = 1428124778. Its totient is φ = 1428124776.

The previous prime is 1428124739. The next prime is 1428124799. The reversal of 1428124777 is 7774218241.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 910289241 + 517835536 = 30171^2 + 22756^2 .

It is a cyclic number.

It is not a de Polignac number, because 1428124777 - 2²³ = 1419736169 is a prime.

It is not a weakly prime, because it can be changed into another prime (1428124277) 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, 714062388 + 714062389.

It is an arithmetic number, because the mean of its divisors is an integer number (714062389).

Almost surely, 2^1428124777 is an apocalyptic number.

It is an amenable number.

1428124777 is a deficient number, since it is larger than the sum of its proper divisors (1).

1428124777 is an equidigital number, since it uses as much as digits as its factorization.

1428124777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 175616, while the sum is 43.

The square root of 1428124777 is about 37790.5381941036. The cubic root of 1428124777 is about 1126.1304921187.

The spelling of 1428124777 in words is "one billion, four hundred twenty-eight million, one hundred twenty-four thousand, seven hundred seventy-seven".