31608155461 has 4 divisors (see below), whose sum is σ = 32379086124. Its totient is φ = 30837224800.

The previous prime is 31608155419. The next prime is 31608155521. The reversal of 31608155461 is 16455180613.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16455180613 = 6599 ⋅2493587.

It can be written as a sum of positive squares in 2 ways, for example, as 2574040225 + 29034115236 = 50735^2 + 170394^2 .

It is a cyclic number.

It is not a de Polignac number, because 31608155461 - 2¹³ = 31608147269 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31608152461) 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, 385465270 + ... + 385465351.

It is an arithmetic number, because the mean of its divisors is an integer number (8094771531).

Almost surely, 2^31608155461 is an apocalyptic number.

It is an amenable number.

31608155461 is a deficient number, since it is larger than the sum of its proper divisors (770930663).

31608155461 is an equidigital number, since it uses as much as digits as its factorization.

31608155461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 770930662.

The product of its (nonzero) digits is 86400, while the sum is 40.

The spelling of 31608155461 in words is "thirty-one billion, six hundred eight million, one hundred fifty-five thousand, four hundred sixty-one".