31461471785 has 4 divisors (see below), whose sum is σ = 37753766148. Its totient is φ = 25169177424.

The previous prime is 31461471781. The next prime is 31461471793. The reversal of 31461471785 is 58717416413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58717416413 = 29 ⋅2024738497.

It can be written as a sum of positive squares in 2 ways, for example, as 24624827929 + 6836643856 = 156923^2 + 82684^2 .

It is a cyclic number.

It is not a de Polignac number, because 31461471785 - 2² = 31461471781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31461471781) 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, 3146147174 + ... + 3146147183.

It is an arithmetic number, because the mean of its divisors is an integer number (9438441537).

Almost surely, 2^31461471785 is an apocalyptic number.

It is an amenable number.

31461471785 is a deficient number, since it is larger than the sum of its proper divisors (6292294363).

31461471785 is an equidigital number, since it uses as much as digits as its factorization.

31461471785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6292294362.

The product of its digits is 564480, while the sum is 47.

The spelling of 31461471785 in words is "thirty-one billion, four hundred sixty-one million, four hundred seventy-one thousand, seven hundred eighty-five".