1331121231 has 24 divisors (see below), whose sum is σ = 2098721664. Its totient is φ = 806279760.

The previous prime is 1331121223. The next prime is 1331121271. The reversal of 1331121231 is 1321211331.

It is not a de Polignac number, because 1331121231 - 2³ = 1331121223 is a prime.

It is a super-2 number, since 2×1331121231² = 3543767463237910722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331121271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 265510 + ... + 270476.

It is an arithmetic number, because the mean of its divisors is an integer number (87446736).

Almost surely, 2^1331121231 is an apocalyptic number.

1331121231 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1331121231 is a deficient number, since it is larger than the sum of its proper divisors (767600433).

1331121231 is a wasteful number, since it uses less digits than its factorization.

1331121231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7691 (or 7688 counting only the distinct ones).

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

The square root of 1331121231 is about 36484.5341343425. The cubic root of 1331121231 is about 1100.0333959558.

Adding to 1331121231 its reverse (1321211331), we get a palindrome (2652332562).

The spelling of 1331121231 in words is "one billion, three hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-one".