31308186461 has 4 divisors (see below), whose sum is σ = 31585250172. Its totient is φ = 31031122752.

The previous prime is 31308186457. The next prime is 31308186479. The reversal of 31308186461 is 16468180313.

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 10739176900 + 20569009561 = 103630^2 + 143419^2 .

It is a cyclic number.

It is not a de Polignac number, because 31308186461 - 2² = 31308186457 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31308186421) 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 3 ways as a sum of consecutive naturals, for example, 138531686 + ... + 138531911.

It is an arithmetic number, because the mean of its divisors is an integer number (7896312543).

Almost surely, 2^31308186461 is an apocalyptic number.

It is an amenable number.

31308186461 is a deficient number, since it is larger than the sum of its proper divisors (277063711).

31308186461 is a wasteful number, since it uses less digits than its factorization.

31308186461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277063710.

The product of its (nonzero) digits is 82944, while the sum is 41.

The spelling of 31308186461 in words is "thirty-one billion, three hundred eight million, one hundred eighty-six thousand, four hundred sixty-one".