1331211231 has 48 divisors (see below), whose sum is σ = 2449324800. Its totient is φ = 678253824.

The previous prime is 1331211199. The next prime is 1331211241. The reversal of 1331211231 is 1321121331.

It is not a de Polignac number, because 1331211231 - 2⁵ = 1331211199 is a prime.

It is a super-2 number, since 2×1331211231² = 3544246683081070722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331211241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12361 + ... + 53058.

It is an arithmetic number, because the mean of its divisors is an integer number (51027600).

Almost surely, 2^1331211231 is an apocalyptic number.

1331211231 is a deficient number, since it is larger than the sum of its proper divisors (1118113569).

1331211231 is a wasteful number, since it uses less digits than its factorization.

1331211231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65468 (or 65465 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 1331211231 is about 36485.7675128261. The cubic root of 1331211231 is about 1100.0581872801.

Adding to 1331211231 its reverse (1321121331), we get a palindrome (2652332562).

The spelling of 1331211231 in words is "one billion, three hundred thirty-one million, two hundred eleven thousand, two hundred thirty-one".