31121101 has 16 divisors (see below), whose sum is σ = 36203328. Its totient is φ = 26438400.

The previous prime is 31121087. The next prime is 31121137. The reversal of 31121101 is 10112113.

It is not a de Polignac number, because 31121101 - 2¹³ = 31112909 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 (31121171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29971 + ... + 30991.

It is an arithmetic number, because the mean of its divisors is an integer number (2262708).

Almost surely, 2^31121101 is an apocalyptic number.

It is an amenable number.

31121101 is a deficient number, since it is larger than the sum of its proper divisors (5082227).

31121101 is a wasteful number, since it uses less digits than its factorization.

31121101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1212.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 31121101 is about 5578.6289534257. The cubic root of 31121101 is about 314.5465921605.

Adding to 31121101 its reverse (10112113), we get a palindrome (41233214).

It can be divided in two parts, 311 and 21101, that added together give a palindrome (21412).

The spelling of 31121101 in words is "thirty-one million, one hundred twenty-one thousand, one hundred one".