31228101 has 12 divisors (see below), whose sum is σ = 46207980. Its totient is φ = 20310720.

The previous prime is 31228081. The next prime is 31228117. The reversal of 31228101 is 10182213.

It can be written as a sum of positive squares in 2 ways, for example, as 16597476 + 14630625 = 4074^2 + 3825^2 .

It is not a de Polignac number, because 31228101 - 2¹¹ = 31226053 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31228801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41946 + ... + 42683.

It is an arithmetic number, because the mean of its divisors is an integer number (3850665).

Almost surely, 2^31228101 is an apocalyptic number.

It is an amenable number.

31228101 is a deficient number, since it is larger than the sum of its proper divisors (14979879).

31228101 is a wasteful number, since it uses less digits than its factorization.

31228101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84676 (or 84673 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 31228101 is about 5588.2108943740. The cubic root of 31228101 is about 314.9066692509.

It can be divided in two parts, 31228 and 101, that added together give a square (31329 = 177²).

The spelling of 31228101 in words is "thirty-one million, two hundred twenty-eight thousand, one hundred one".