3231211381 has 2 divisors, whose sum is σ = 3231211382. Its totient is φ = 3231211380.

The previous prime is 3231211363. The next prime is 3231211391. The reversal of 3231211381 is 1831121323.

It is a happy number.

3231211381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3211488900 + 19722481 = 56670^2 + 4441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3231211381 is a prime.

It is a super-2 number, since 2×3231211381² = 20881453977407854322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3231211391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1615605690 + 1615605691.

It is an arithmetic number, because the mean of its divisors is an integer number (1615605691).

Almost surely, 2^3231211381 is an apocalyptic number.

It is an amenable number.

3231211381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3231211381 is an equidigital number, since it uses as much as digits as its factorization.

3231211381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 25.

The square root of 3231211381 is about 56843.7453111598. The cubic root of 3231211381 is about 1478.3880948702.

The spelling of 3231211381 in words is "three billion, two hundred thirty-one million, two hundred eleven thousand, three hundred eighty-one".