1302011989 has 2 divisors, whose sum is σ = 1302011990. Its totient is φ = 1302011988.

The previous prime is 1302011957. The next prime is 1302012029. The reversal of 1302011989 is 9891102031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684240964 + 617771025 = 26158^2 + 24855^2 .

It is a cyclic number.

It is not a de Polignac number, because 1302011989 - 2⁵ = 1302011957 is a prime.

It is a super-2 number, since 2×1302011989² = 3390470438999472242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1302011089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 651005994 + 651005995.

It is an arithmetic number, because the mean of its divisors is an integer number (651005995).

Almost surely, 2^1302011989 is an apocalyptic number.

It is an amenable number.

1302011989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1302011989 is an equidigital number, since it uses as much as digits as its factorization.

1302011989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1302011989 is about 36083.4032347283. The cubic root of 1302011989 is about 1091.9556365510.

The spelling of 1302011989 in words is "one billion, three hundred two million, eleven thousand, nine hundred eighty-nine".