31521666119 has 2 divisors, whose sum is σ = 31521666120. Its totient is φ = 31521666118.

The previous prime is 31521666097. The next prime is 31521666131. The reversal of 31521666119 is 91166612513.

It is a strong prime.

It is an emirp because it is prime and its reverse (91166612513) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31521666119 - 2¹² = 31521662023 is a prime.

It is a super-2 number, since 2×31521666119² (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 (31521666139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15760833059 + 15760833060.

It is an arithmetic number, because the mean of its divisors is an integer number (15760833060).

Almost surely, 2^31521666119 is an apocalyptic number.

31521666119 is a deficient number, since it is larger than the sum of its proper divisors (1).

31521666119 is an equidigital number, since it uses as much as digits as its factorization.

31521666119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 41.

The spelling of 31521666119 in words is "thirty-one billion, five hundred twenty-one million, six hundred sixty-six thousand, one hundred nineteen".