31540213349 has 2 divisors, whose sum is σ = 31540213350. Its totient is φ = 31540213348.

The previous prime is 31540213307. The next prime is 31540213361. The reversal of 31540213349 is 94331204513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17296984324 + 14243229025 = 131518^2 + 119345^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31540213349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31540216349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15770106674 + 15770106675.

It is an arithmetic number, because the mean of its divisors is an integer number (15770106675).

Almost surely, 2^31540213349 is an apocalyptic number.

It is an amenable number.

31540213349 is a deficient number, since it is larger than the sum of its proper divisors (1).

31540213349 is an equidigital number, since it uses as much as digits as its factorization.

31540213349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 31540213349 in words is "thirty-one billion, five hundred forty million, two hundred thirteen thousand, three hundred forty-nine".