31120005 has 48 divisors (see below), whose sum is σ = 60130944. Its totient is φ = 13461120.

The previous prime is 31119983. The next prime is 31120009. The reversal of 31120005 is 50002113.

It is not a de Polignac number, because 31120005 - 2⁶ = 31119941 is a prime.

It is a super-2 number, since 2×31120005² = 1936909422400050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31120009) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 37495 + ... + 38315.

It is an arithmetic number, because the mean of its divisors is an integer number (1252728).

Almost surely, 2^31120005 is an apocalyptic number.

31120005 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

31120005 is a deficient number, since it is larger than the sum of its proper divisors (29010939).

31120005 is a wasteful number, since it uses less digits than its factorization.

31120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 855 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 31120005 is about 5578.5307205392. The cubic root of 31120005 is about 314.5428996271.

Adding to 31120005 its reverse (50002113), we get a palindrome (81122118).

The spelling of 31120005 in words is "thirty-one million, one hundred twenty thousand, five".