1956428779 has 2 divisors, whose sum is σ = 1956428780. Its totient is φ = 1956428778.

The previous prime is 1956428717. The next prime is 1956428807. The reversal of 1956428779 is 9778246591.

It is a strong prime.

It is an emirp because it is prime and its reverse (9778246591) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1956428779 - 2⁹ = 1956428267 is a prime.

It is a super-2 number, since 2×1956428779² = 7655227134598861682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1956428179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978214389 + 978214390.

It is an arithmetic number, because the mean of its divisors is an integer number (978214390).

Almost surely, 2^1956428779 is an apocalyptic number.

1956428779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1956428779 is an equidigital number, since it uses as much as digits as its factorization.

1956428779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7620480, while the sum is 58.

The square root of 1956428779 is about 44231.5360235206. The cubic root of 1956428779 is about 1250.7044091583.

The spelling of 1956428779 in words is "one billion, nine hundred fifty-six million, four hundred twenty-eight thousand, seven hundred seventy-nine".