31604332381 has 2 divisors, whose sum is σ = 31604332382. Its totient is φ = 31604332380.

The previous prime is 31604332297. The next prime is 31604332391. The reversal of 31604332381 is 18323340613.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18678688900 + 12925643481 = 136670^2 + 113691^2 .

It is a cyclic number.

It is not a de Polignac number, because 31604332381 - 2¹³ = 31604324189 is a prime.

It is a super-2 number, since 2×31604332381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31604332391) 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, 15802166190 + 15802166191.

It is an arithmetic number, because the mean of its divisors is an integer number (15802166191).

Almost surely, 2^31604332381 is an apocalyptic number.

It is an amenable number.

31604332381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31604332381 is an equidigital number, since it uses as much as digits as its factorization.

31604332381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 31604332381 its reverse (18323340613), we get a palindrome (49927672994).

The spelling of 31604332381 in words is "thirty-one billion, six hundred four million, three hundred thirty-two thousand, three hundred eighty-one".