20111132989 has 2 divisors, whose sum is σ = 20111132990. Its totient is φ = 20111132988.

The previous prime is 20111132953. The next prime is 20111133061. The reversal of 20111132989 is 98923111102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13475727225 + 6635405764 = 116085^2 + 81458^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111132989 - 2¹⁹ = 20110608701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111132929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055566494 + 10055566495.

It is an arithmetic number, because the mean of its divisors is an integer number (10055566495).

Almost surely, 2^20111132989 is an apocalyptic number.

It is an amenable number.

20111132989 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111132989 is an equidigital number, since it uses as much as digits as its factorization.

20111132989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 37.

It can be divided in two parts, 2011113 and 2989, that added together give a palindrome (2014102).

The spelling of 20111132989 in words is "twenty billion, one hundred eleven million, one hundred thirty-two thousand, nine hundred eighty-nine".