1331234381 has 2 divisors, whose sum is σ = 1331234382. Its totient is φ = 1331234380.

The previous prime is 1331234369. The next prime is 1331234543. The reversal of 1331234381 is 1834321331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 787924900 + 543309481 = 28070^2 + 23309^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331234381 - 2¹⁰ = 1331233357 is a prime.

It is a super-2 number, since 2×1331234381² = 3544369954312906322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1331234341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665617190 + 665617191.

It is an arithmetic number, because the mean of its divisors is an integer number (665617191).

Almost surely, 2^1331234381 is an apocalyptic number.

It is an amenable number.

1331234381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1331234381 is an equidigital number, since it uses as much as digits as its factorization.

1331234381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 29.

The square root of 1331234381 is about 36486.0847584391. The cubic root of 1331234381 is about 1100.0645639790.

The spelling of 1331234381 in words is "one billion, three hundred thirty-one million, two hundred thirty-four thousand, three hundred eighty-one".