11111022009 has 6 divisors (see below), whose sum is σ = 16049254026. Its totient is φ = 7407348000.

The previous prime is 11111022001. The next prime is 11111022029. The reversal of 11111022009 is 90022011111.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8059011984 + 3052010025 = 89772^2 + 55245^2 .

It is not a de Polignac number, because 11111022009 - 2³ = 11111022001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11111021982 and 11111022000.

It is not an unprimeable number, because it can be changed into a prime (11111022001) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 617278992 + ... + 617279009.

It is an arithmetic number, because the mean of its divisors is an integer number (2674875671).

Almost surely, 2^11111022009 is an apocalyptic number.

It is an amenable number.

11111022009 is a deficient number, since it is larger than the sum of its proper divisors (4938232017).

11111022009 is a wasteful number, since it uses less digits than its factorization.

11111022009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234558007 (or 1234558004 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

It can be divided in two parts, 1111102 and 2009, that added together give a palindrome (1113111).

The spelling of 11111022009 in words is "eleven billion, one hundred eleven million, twenty-two thousand, nine".