1342199981 has 2 divisors, whose sum is σ = 1342199982. Its totient is φ = 1342199980.

The previous prime is 1342199959. The next prime is 1342199987. The reversal of 1342199981 is 1899912431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 986274025 + 355925956 = 31405^2 + 18866^2 .

It is an emirp because it is prime and its reverse (1899912431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1342199981 - 2²² = 1338005677 is a prime.

It is a super-2 number, since 2×1342199981² = 3603001577992800722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1342199987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 671099990 + 671099991.

It is an arithmetic number, because the mean of its divisors is an integer number (671099991).

Almost surely, 2^1342199981 is an apocalyptic number.

It is an amenable number.

1342199981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1342199981 is an equidigital number, since it uses as much as digits as its factorization.

1342199981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 1342199981 is about 36636.0475624760. The cubic root of 1342199981 is about 1103.0767802124.

The spelling of 1342199981 in words is "one billion, three hundred forty-two million, one hundred ninety-nine thousand, nine hundred eighty-one".