20111232409 has 2 divisors, whose sum is σ = 20111232410. Its totient is φ = 20111232408.

The previous prime is 20111232403. The next prime is 20111232419. The reversal of 20111232409 is 90423211102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16946832400 + 3164400009 = 130180^2 + 56253^2 .

It is a cyclic number.

It is not a de Polignac number, because 20111232409 - 2²¹ = 20109135257 is a prime.

It is not a weakly prime, because it can be changed into another prime (20111232403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055616204 + 10055616205.

It is an arithmetic number, because the mean of its divisors is an integer number (10055616205).

Almost surely, 2^20111232409 is an apocalyptic number.

It is an amenable number.

20111232409 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111232409 is an equidigital number, since it uses as much as digits as its factorization.

20111232409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 20111232409 in words is "twenty billion, one hundred eleven million, two hundred thirty-two thousand, four hundred nine".