31120361 has 4 divisors (see below), whose sum is σ = 31584912. Its totient is φ = 30655812.

The previous prime is 31120351. The next prime is 31120379. The reversal of 31120361 is 16302113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31120361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31120301) 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, 232175 + ... + 232308.

It is an arithmetic number, because the mean of its divisors is an integer number (7896228).

Almost surely, 2^31120361 is an apocalyptic number.

It is an amenable number.

31120361 is a deficient number, since it is larger than the sum of its proper divisors (464551).

31120361 is an equidigital number, since it uses as much as digits as its factorization.

31120361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464550.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 31120361 is about 5578.5626284913. The cubic root of 31120361 is about 314.5440990361.

Adding to 31120361 its reverse (16302113), we get a palindrome (47422474).

The spelling of 31120361 in words is "thirty-one million, one hundred twenty thousand, three hundred sixty-one".