31200105 has 32 divisors (see below), whose sum is σ = 51932160. Its totient is φ = 15978240.

The previous prime is 31200089. The next prime is 31200137. The reversal of 31200105 is 50100213.

It is not a de Polignac number, because 31200105 - 2⁴ = 31200089 is a prime.

It is a super-2 number, since 2×31200105² = 1946893104022050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106339 + ... + 106631.

It is an arithmetic number, because the mean of its divisors is an integer number (1622880).

Almost surely, 2^31200105 is an apocalyptic number.

It is an amenable number.

31200105 is a deficient number, since it is larger than the sum of its proper divisors (20732055).

31200105 is a wasteful number, since it uses less digits than its factorization.

31200105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561.

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

The square root of 31200105 is about 5585.7054165074. The cubic root of 31200105 is about 314.8125364806.

Adding to 31200105 its reverse (50100213), we get a palindrome (81300318).

The spelling of 31200105 in words is "thirty-one million, two hundred thousand, one hundred five".