1420799981 has 2 divisors, whose sum is σ = 1420799982. Its totient is φ = 1420799980.

The previous prime is 1420799977. The next prime is 1420800001. The reversal of 1420799981 is 1899970241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1007491081 + 413308900 = 31741^2 + 20330^2 .

It is a cyclic number.

It is not a de Polignac number, because 1420799981 - 2² = 1420799977 is a prime.

It is a super-2 number, since 2×1420799981² = 4037345172019200722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1420799951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 710399990 + 710399991.

It is an arithmetic number, because the mean of its divisors is an integer number (710399991).

Almost surely, 2^1420799981 is an apocalyptic number.

It is an amenable number.

1420799981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1420799981 is an equidigital number, since it uses as much as digits as its factorization.

1420799981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 1420799981 is about 37693.5005140143. The cubic root of 1420799981 is about 1124.2018980730.

The spelling of 1420799981 in words is "one billion, four hundred twenty million, seven hundred ninety-nine thousand, nine hundred eighty-one".