1089020535981 has 16 divisors (see below), whose sum is σ = 1664761663104. Its totient is φ = 620309274624.

The previous prime is 1089020535943. The next prime is 1089020535991. The reversal of 1089020535981 is 1895350209801.

It is not a de Polignac number, because 1089020535981 - 2¹⁰ = 1089020534957 is a prime.

It is a super-2 number, since 2×1089020535981² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1089020535991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82833876 + ... + 82847021.

It is an arithmetic number, because the mean of its divisors is an integer number (104047603944).

Almost surely, 2^{1089020535981} is an apocalyptic number.

It is an amenable number.

1089020535981 is a deficient number, since it is larger than the sum of its proper divisors (575741127123).

1089020535981 is a wasteful number, since it uses less digits than its factorization.

1089020535981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165681220.

The product of its (nonzero) digits is 777600, while the sum is 51.

The spelling of 1089020535981 in words is "one trillion, eighty-nine billion, twenty million, five hundred thirty-five thousand, nine hundred eighty-one".