1233840161 has 4 divisors (see below), whose sum is σ = 1306419012. Its totient is φ = 1161261312.

The previous prime is 1233840149. The next prime is 1233840163. The reversal of 1233840161 is 1610483321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 596580625 + 637259536 = 24425^2 + 25244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1233840161 - 2¹⁰ = 1233839137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1233840163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36289400 + ... + 36289433.

It is an arithmetic number, because the mean of its divisors is an integer number (326604753).

Almost surely, 2^1233840161 is an apocalyptic number.

It is an amenable number.

1233840161 is a deficient number, since it is larger than the sum of its proper divisors (72578851).

1233840161 is an equidigital number, since it uses as much as digits as its factorization.

1233840161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72578850.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1233840161 is about 35126.0609946518. The cubic root of 1233840161 is about 1072.5551538226. Note that the first 3 decimals are identical.

The spelling of 1233840161 in words is "one billion, two hundred thirty-three million, eight hundred forty thousand, one hundred sixty-one".