31719415349 has 2 divisors, whose sum is σ = 31719415350. Its totient is φ = 31719415348.

The previous prime is 31719415313. The next prime is 31719415369. The reversal of 31719415349 is 94351491713.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25618243249 + 6101172100 = 160057^2 + 78110^2 .

It is a cyclic number.

It is not a de Polignac number, because 31719415349 - 2¹² = 31719411253 is a prime.

It is a super-2 number, since 2×31719415349² (a number of 22 digits) contains 22 as substring.

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 (31719415369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15859707674 + 15859707675.

It is an arithmetic number, because the mean of its divisors is an integer number (15859707675).

Almost surely, 2^31719415349 is an apocalyptic number.

It is an amenable number.

31719415349 is a deficient number, since it is larger than the sum of its proper divisors (1).

31719415349 is an equidigital number, since it uses as much as digits as its factorization.

31719415349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The spelling of 31719415349 in words is "thirty-one billion, seven hundred nineteen million, four hundred fifteen thousand, three hundred forty-nine".