1331233401 has 4 divisors (see below), whose sum is σ = 1774977872. Its totient is φ = 887488932.

The previous prime is 1331233391. The next prime is 1331233427. The reversal of 1331233401 is 1043321331.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-1331233401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1331233481) 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, 221872231 + ... + 221872236.

It is an arithmetic number, because the mean of its divisors is an integer number (443744468).

Almost surely, 2^1331233401 is an apocalyptic number.

It is an amenable number.

1331233401 is a deficient number, since it is larger than the sum of its proper divisors (443744471).

1331233401 is an equidigital number, since it uses as much as digits as its factorization.

1331233401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443744470.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 1331233401 is about 36486.0713286591. The cubic root of 1331233401 is about 1100.0642940381.

Adding to 1331233401 its reverse (1043321331), we get a palindrome (2374554732).

The spelling of 1331233401 in words is "one billion, three hundred thirty-one million, two hundred thirty-three thousand, four hundred one".