1981012101269 has 4 divisors (see below), whose sum is σ = 1992079208160. Its totient is φ = 1969944994380.

The previous prime is 1981012101247. The next prime is 1981012101317. The reversal of 1981012101269 is 9621012101891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1981012101269 - 2¹² = 1981012097173 is a prime.

It is a super-3 number, since 3×1981012101269³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981012101869) 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, 5533553177 + ... + 5533553534.

It is an arithmetic number, because the mean of its divisors is an integer number (498019802040).

Almost surely, 2^{1981012101269} is an apocalyptic number.

It is an amenable number.

1981012101269 is a deficient number, since it is larger than the sum of its proper divisors (11067106891).

1981012101269 is a wasteful number, since it uses less digits than its factorization.

1981012101269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11067106890.

The product of its (nonzero) digits is 15552, while the sum is 41.

The spelling of 1981012101269 in words is "one trillion, nine hundred eighty-one billion, twelve million, one hundred one thousand, two hundred sixty-nine".