1421669779 has 2 divisors, whose sum is σ = 1421669780. Its totient is φ = 1421669778.

The previous prime is 1421669747. The next prime is 1421669783. The reversal of 1421669779 is 9779661241.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1421669779 - 2⁵ = 1421669747 is a prime.

It is a super-2 number, since 2×1421669779² = 4042289921043817682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1421669719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710834889 + 710834890.

It is an arithmetic number, because the mean of its divisors is an integer number (710834890).

Almost surely, 2^1421669779 is an apocalyptic number.

1421669779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1421669779 is an equidigital number, since it uses as much as digits as its factorization.

1421669779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 1421669779 is about 37705.0365203377. The cubic root of 1421669779 is about 1124.4312592556.

The spelling of 1421669779 in words is "one billion, four hundred twenty-one million, six hundred sixty-nine thousand, seven hundred seventy-nine".