105120031 has 4 divisors (see below), whose sum is σ = 105283152. Its totient is φ = 104956912.

The previous prime is 105120013. The next prime is 105120107. The reversal of 105120031 is 130021501.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 105120031 - 2⁵ = 105119999 is a prime.

It is a super-2 number, since 2×105120031² = 22100441834881922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 105119993 and 105120020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105120011) 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, 80590 + ... + 81883.

It is an arithmetic number, because the mean of its divisors is an integer number (26320788).

Almost surely, 2^105120031 is an apocalyptic number.

105120031 is a deficient number, since it is larger than the sum of its proper divisors (163121).

105120031 is an equidigital number, since it uses as much as digits as its factorization.

105120031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163120.

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 105120031 is about 10252.8060061624. The cubic root of 105120031 is about 471.9490976779.

Adding to 105120031 its reverse (130021501), we get a palindrome (235141532).

The spelling of 105120031 in words is "one hundred five million, one hundred twenty thousand, thirty-one".