31321492109 has 2 divisors, whose sum is σ = 31321492110. Its totient is φ = 31321492108.

The previous prime is 31321492091. The next prime is 31321492129. The reversal of 31321492109 is 90129412313.

Together with previous prime (31321492091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25479182884 + 5842309225 = 159622^2 + 76435^2 .

It is an emirp because it is prime and its reverse (90129412313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31321492109 - 2¹² = 31321488013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31321492129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660746054 + 15660746055.

It is an arithmetic number, because the mean of its divisors is an integer number (15660746055).

Almost surely, 2^31321492109 is an apocalyptic number.

It is an amenable number.

31321492109 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321492109 is an equidigital number, since it uses as much as digits as its factorization.

31321492109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 31321492109 in words is "thirty-one billion, three hundred twenty-one million, four hundred ninety-two thousand, one hundred nine".