11909901033 has 12 divisors (see below), whose sum is σ = 17208850308. Its totient is φ = 7937321760.

The previous prime is 11909901001. The next prime is 11909901037. The reversal of 11909901033 is 33010990911.

It can be written as a sum of positive squares in 2 ways, for example, as 7805192409 + 4104708624 = 88347^2 + 64068^2 .

It is not a de Polignac number, because 11909901033 - 2⁵ = 11909901001 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (11909901037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 188610 + ... + 243707.

It is an arithmetic number, because the mean of its divisors is an integer number (1434070859).

Almost surely, 2^11909901033 is an apocalyptic number.

It is an amenable number.

11909901033 is a deficient number, since it is larger than the sum of its proper divisors (5298949275).

11909901033 is a wasteful number, since it uses less digits than its factorization.

11909901033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435384 (or 435381 counting only the distinct ones).

The product of its (nonzero) digits is 6561, while the sum is 36.

The spelling of 11909901033 in words is "eleven billion, nine hundred nine million, nine hundred one thousand, thirty-three".