1303999681 has 2 divisors, whose sum is σ = 1303999682. Its totient is φ = 1303999680.

The previous prime is 1303999663. The next prime is 1303999693. The reversal of 1303999681 is 1869993031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 824608656 + 479391025 = 28716^2 + 21895^2 .

It is a cyclic number.

It is not a de Polignac number, because 1303999681 - 2²⁷ = 1169781953 is a prime.

It is a super-2 number, since 2×1303999681² = 3400830336096203522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1303999481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651999840 + 651999841.

It is an arithmetic number, because the mean of its divisors is an integer number (651999841).

Almost surely, 2^1303999681 is an apocalyptic number.

It is an amenable number.

1303999681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1303999681 is an equidigital number, since it uses as much as digits as its factorization.

1303999681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 314928, while the sum is 49.

The square root of 1303999681 is about 36110.9357535913. The cubic root of 1303999681 is about 1092.5110251686.

The spelling of 1303999681 in words is "one billion, three hundred three million, nine hundred ninety-nine thousand, six hundred eighty-one".