1351679981 has 2 divisors, whose sum is σ = 1351679982. Its totient is φ = 1351679980.

The previous prime is 1351679963. The next prime is 1351679993. The reversal of 1351679981 is 1899761531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1350930025 + 749956 = 36755^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 1351679981 - 2¹⁴ = 1351663597 is a prime.

It is a super-2 number, since 2×1351679981² = 3654077542072320722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1351676981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 675839990 + 675839991.

It is an arithmetic number, because the mean of its divisors is an integer number (675839991).

Almost surely, 2^1351679981 is an apocalyptic number.

It is an amenable number.

1351679981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1351679981 is an equidigital number, since it uses as much as digits as its factorization.

1351679981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 50.

The square root of 1351679981 is about 36765.2006794469. The cubic root of 1351679981 is about 1105.6677116212.

The spelling of 1351679981 in words is "one billion, three hundred fifty-one million, six hundred seventy-nine thousand, nine hundred eighty-one".