31320085261 has 8 divisors (see below), whose sum is σ = 32417099264. Its totient is φ = 30228489360.

The previous prime is 31320085259. The next prime is 31320085339. The reversal of 31320085261 is 16258002313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31320085261 - 2¹ = 31320085259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320089261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1342761 + ... + 1365886.

It is an arithmetic number, because the mean of its divisors is an integer number (4052137408).

Almost surely, 2^31320085261 is an apocalyptic number.

31320085261 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31320085261 is a deficient number, since it is larger than the sum of its proper divisors (1097014003).

31320085261 is a wasteful number, since it uses less digits than its factorization.

31320085261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2709051.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 31320085261 its reverse (16258002313), we get a palindrome (47578087574).

The spelling of 31320085261 in words is "thirty-one billion, three hundred twenty million, eighty-five thousand, two hundred sixty-one".