31200101 has 4 divisors (see below), whose sum is σ = 31329804. Its totient is φ = 31070400.

The previous prime is 31200089. The next prime is 31200137. The reversal of 31200101 is 10100213.

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 12967201 + 18232900 = 3601^2 + 4270^2 .

It is a cyclic number.

It is not a de Polignac number, because 31200101 - 2¹⁴ = 31183717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200901) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 64490 + ... + 64971.

It is an arithmetic number, because the mean of its divisors is an integer number (7832451).

Almost surely, 2^31200101 is an apocalyptic number.

It is an amenable number.

31200101 is a deficient number, since it is larger than the sum of its proper divisors (129703).

31200101 is a wasteful number, since it uses less digits than its factorization.

31200101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129702.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 31200101 is about 5585.7050584505. The cubic root of 31200101 is about 314.8125230271.

Adding to 31200101 its reverse (10100213), we get a palindrome (41300314).

The spelling of 31200101 in words is "thirty-one million, two hundred thousand, one hundred one".