31540010065 has 4 divisors (see below), whose sum is σ = 37848012084. Its totient is φ = 25232008048.

The previous prime is 31540010063. The next prime is 31540010069. The reversal of 31540010065 is 56001004513.

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 23760064449 + 7779945616 = 154143^2 + 88204^2 .

It is a cyclic number.

It is not a de Polignac number, because 31540010065 - 2¹ = 31540010063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31540010063) 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, 3154001002 + ... + 3154001011.

It is an arithmetic number, because the mean of its divisors is an integer number (9462003021).

Almost surely, 2^31540010065 is an apocalyptic number.

It is an amenable number.

31540010065 is a deficient number, since it is larger than the sum of its proper divisors (6308002019).

31540010065 is an equidigital number, since it uses as much as digits as its factorization.

31540010065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6308002018.

The product of its (nonzero) digits is 1800, while the sum is 25.

Adding to 31540010065 its reverse (56001004513), we get a palindrome (87541014578).

The spelling of 31540010065 in words is "thirty-one billion, five hundred forty million, ten thousand, sixty-five".