1201231331 has 4 divisors (see below), whose sum is σ = 1202219592. Its totient is φ = 1200243072.

The previous prime is 1201231313. The next prime is 1201231349. The reversal of 1201231331 is 1331321021.

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

It is an interprime number because it is at equal distance from previous prime (1201231313) and next prime (1201231349).

It is a cyclic number.

It is not a de Polignac number, because 1201231331 - 2²² = 1197037027 is a prime.

It is a super-2 number, since 2×1201231331² = 2885913421152063122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201231351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492305 + ... + 494738.

It is an arithmetic number, because the mean of its divisors is an integer number (300554898).

Almost surely, 2^1201231331 is an apocalyptic number.

1201231331 is a deficient number, since it is larger than the sum of its proper divisors (988261).

1201231331 is an equidigital number, since it uses as much as digits as its factorization.

1201231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988260.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1201231331 is about 34658.7843266321. The cubic root of 1201231331 is about 1063.0219128338.

Adding to 1201231331 its reverse (1331321021), we get a palindrome (2532552352).

The spelling of 1201231331 in words is "one billion, two hundred one million, two hundred thirty-one thousand, three hundred thirty-one".