31443203404381 has 2 divisors, whose sum is σ = 31443203404382. Its totient is φ = 31443203404380.

The previous prime is 31443203404357. The next prime is 31443203404409. The reversal of 31443203404381 is 18340430234413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24264737105625 + 7178466298756 = 4925925^2 + 2679266^2 .

It is a cyclic number.

It is not a de Polignac number, because 31443203404381 - 2⁹ = 31443203403869 is a prime.

It is a super-2 number, since 2×31443203404381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31443203401381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15721601702190 + 15721601702191.

It is an arithmetic number, because the mean of its divisors is an integer number (15721601702191).

Almost surely, 2^{31443203404381} is an apocalyptic number.

It is an amenable number.

31443203404381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31443203404381 is an equidigital number, since it uses as much as digits as its factorization.

31443203404381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 40.

Adding to 31443203404381 its reverse (18340430234413), we get a palindrome (49783633638794).

The spelling of 31443203404381 in words is "thirty-one trillion, four hundred forty-three billion, two hundred three million, four hundred four thousand, three hundred eighty-one".