1001120111989 has 2 divisors, whose sum is σ = 1001120111990. Its totient is φ = 1001120111988.

The previous prime is 1001120111977. The next prime is 1001120112023. The reversal of 1001120111989 is 9891110211001.

It is a happy number.

It is an a-pointer prime, because the next prime (1001120112023) can be obtained adding 1001120111989 to its sum of digits (34).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 635754264964 + 365365847025 = 797342^2 + 604455^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001120111989 - 2³¹ = 998972628341 is a prime.

It is a super-2 number, since 2×1001120111989² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1001120112989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500560055994 + 500560055995.

It is an arithmetic number, because the mean of its divisors is an integer number (500560055995).

Almost surely, 2^{1001120111989} is an apocalyptic number.

It is an amenable number.

1001120111989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001120111989 is an equidigital number, since it uses as much as digits as its factorization.

1001120111989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 34.

The spelling of 1001120111989 in words is "one trillion, one billion, one hundred twenty million, one hundred eleven thousand, nine hundred eighty-nine".