31540500105313 has 4 divisors (see below), whose sum is σ = 31609516517380. Its totient is φ = 31471483693248.

The previous prime is 31540500105311. The next prime is 31540500105349. The reversal of 31540500105313 is 31350100504513.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29461577333904 + 2078922771409 = 5427852^2 + 1441847^2 .

It is a cyclic number.

It is not a de Polignac number, because 31540500105313 - 2¹ = 31540500105311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540500105311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34508205348 + ... + 34508206261.

It is an arithmetic number, because the mean of its divisors is an integer number (7902379129345).

Almost surely, 2^{31540500105313} is an apocalyptic number.

It is an amenable number.

31540500105313 is a deficient number, since it is larger than the sum of its proper divisors (69016412067).

31540500105313 is an equidigital number, since it uses as much as digits as its factorization.

31540500105313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69016412066.

The product of its (nonzero) digits is 13500, while the sum is 31.

Adding to 31540500105313 its reverse (31350100504513), we get a palindrome (62890600609826).

The spelling of 31540500105313 in words is "thirty-one trillion, five hundred forty billion, five hundred million, one hundred five thousand, three hundred thirteen".