1301999999 has 2 divisors, whose sum is σ = 1302000000. Its totient is φ = 1301999998.

The previous prime is 1301999987. The next prime is 1302000013. The reversal of 1301999999 is 9999991031.

It is a weak prime.

It is an emirp because it is prime and its reverse (9999991031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1301999999 - 2¹⁶ = 1301934463 is a prime.

1301999999 is a modest number, since divided by 99999 gives 13019 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1301999099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 650999999 + 651000000.

It is an arithmetic number, because the mean of its divisors is an integer number (651000000).

Almost surely, 2^1301999999 is an apocalyptic number.

1301999999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1301999999 is an equidigital number, since it uses as much as digits as its factorization.

1301999999 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1594323, while the sum is 59.

The square root of 1301999999 is about 36083.2370914806. The cubic root of 1301999999 is about 1091.9522846648.

The spelling of 1301999999 in words is "one billion, three hundred one million, nine hundred ninety-nine thousand, nine hundred ninety-nine".