1301021999 has 4 divisors (see below), whose sum is σ = 1301094336. Its totient is φ = 1300949664.

The previous prime is 1301021971. The next prime is 1301022031. The reversal of 1301021999 is 9991201031.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1301021999 - 2¹⁶ = 1300956463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1301021399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14087 + ... + 52919.

It is an arithmetic number, because the mean of its divisors is an integer number (325273584).

Almost surely, 2^1301021999 is an apocalyptic number.

1301021999 is a deficient number, since it is larger than the sum of its proper divisors (72337).

1301021999 is an equidigital number, since it uses as much as digits as its factorization.

1301021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72336.

The product of its (nonzero) digits is 4374, while the sum is 35.

The square root of 1301021999 is about 36069.6825464267. The cubic root of 1301021999 is about 1091.6788087714.

The spelling of 1301021999 in words is "one billion, three hundred one million, twenty-one thousand, nine hundred ninety-nine".