1346851981 has 2 divisors, whose sum is σ = 1346851982. Its totient is φ = 1346851980.

The previous prime is 1346851973. The next prime is 1346851991. The reversal of 1346851981 is 1891586431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1335902500 + 10949481 = 36550^2 + 3309^2 .

It is a cyclic number.

It is not a de Polignac number, because 1346851981 - 2³ = 1346851973 is a prime.

It is a super-2 number, since 2×1346851981² = 3628020517447248722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1346851931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 673425990 + 673425991.

It is an arithmetic number, because the mean of its divisors is an integer number (673425991).

Almost surely, 2^1346851981 is an apocalyptic number.

It is an amenable number.

1346851981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1346851981 is an equidigital number, since it uses as much as digits as its factorization.

1346851981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 46.

The square root of 1346851981 is about 36699.4820263175. The cubic root of 1346851981 is about 1104.3497142307.

The spelling of 1346851981 in words is "one billion, three hundred forty-six million, eight hundred fifty-one thousand, nine hundred eighty-one".