2191233409 has 2 divisors, whose sum is σ = 2191233410. Its totient is φ = 2191233408.

The previous prime is 2191233403. The next prime is 2191233439. The reversal of 2191233409 is 9043321912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1531000384 + 660233025 = 39128^2 + 25695^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191233409 - 2⁷ = 2191233281 is a prime.

It is a super-2 number, since 2×2191233409² = 9603007705435522562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2191233403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095616704 + 1095616705.

It is an arithmetic number, because the mean of its divisors is an integer number (1095616705).

Almost surely, 2^2191233409 is an apocalyptic number.

It is an amenable number.

2191233409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191233409 is an equidigital number, since it uses as much as digits as its factorization.

2191233409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 2191233409 is about 46810.6121408383. The cubic root of 2191233409 is about 1298.8616087436.

The spelling of 2191233409 in words is "two billion, one hundred ninety-one million, two hundred thirty-three thousand, four hundred nine".