2143432381 has 2 divisors, whose sum is σ = 2143432382. Its totient is φ = 2143432380.

The previous prime is 2143432363. The next prime is 2143432387. The reversal of 2143432381 is 1832343412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2012329881 + 131102500 = 44859^2 + 11450^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143432381 - 2⁹ = 2143431869 is a prime.

It is a super-2 number, since 2×2143432381² = 9188604743838658322, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2143432387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1071716190 + 1071716191.

It is an arithmetic number, because the mean of its divisors is an integer number (1071716191).

Almost surely, 2^2143432381 is an apocalyptic number.

It is an amenable number.

2143432381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143432381 is an equidigital number, since it uses as much as digits as its factorization.

2143432381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 2143432381 is about 46297.2178537761. The cubic root of 2143432381 is about 1289.3473414660.

Adding to 2143432381 its reverse (1832343412), we get a palindrome (3975775793).

The spelling of 2143432381 in words is "two billion, one hundred forty-three million, four hundred thirty-two thousand, three hundred eighty-one".