31161485 has 4 divisors (see below), whose sum is σ = 37393788. Its totient is φ = 24929184.

The previous prime is 31161469. The next prime is 31161521. The reversal of 31161485 is 58416113.

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 11854249 + 19307236 = 3443^2 + 4394^2 .

It is a cyclic number.

It is not a de Polignac number, because 31161485 - 2⁴ = 31161469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3116144 + ... + 3116153.

It is an arithmetic number, because the mean of its divisors is an integer number (9348447).

Almost surely, 2^31161485 is an apocalyptic number.

It is an amenable number.

31161485 is a deficient number, since it is larger than the sum of its proper divisors (6232303).

31161485 is an equidigital number, since it uses as much as digits as its factorization.

31161485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6232302.

The product of its digits is 2880, while the sum is 29.

The square root of 31161485 is about 5582.2473073127. The cubic root of 31161485 is about 314.6825894810.

Adding to 31161485 its reverse (58416113), we get a palindrome (89577598).

The spelling of 31161485 in words is "thirty-one million, one hundred sixty-one thousand, four hundred eighty-five".