31305485 has 4 divisors (see below), whose sum is σ = 37566588. Its totient is φ = 25044384.

The previous prime is 31305479. The next prime is 31305487. The reversal of 31305485 is 58450313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58450313 = 619 ⋅94427.

It can be written as a sum of positive squares in 2 ways, for example, as 6165289 + 25140196 = 2483^2 + 5014^2 .

It is a cyclic number.

It is not a de Polignac number, because 31305485 - 2⁸ = 31305229 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 (31305487) 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, 3130544 + ... + 3130553.

It is an arithmetic number, because the mean of its divisors is an integer number (9391647).

Almost surely, 2^31305485 is an apocalyptic number.

It is an amenable number.

31305485 is a deficient number, since it is larger than the sum of its proper divisors (6261103).

31305485 is an equidigital number, since it uses as much as digits as its factorization.

31305485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261102.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 31305485 is about 5595.1304721159. The cubic root of 31305485 is about 315.1665701714.

Adding to 31305485 its reverse (58450313), we get a palindrome (89755798).

The spelling of 31305485 in words is "thirty-one million, three hundred five thousand, four hundred eighty-five".