3131012121 has 32 divisors (see below), whose sum is σ = 4381974528. Its totient is φ = 1986145920.

The previous prime is 3131012119. The next prime is 3131012123. The reversal of 3131012121 is 1212101313.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3131012119) and next prime (3131012123).

It is not a de Polignac number, because 3131012121 - 2¹ = 3131012119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3131012121.

It is not an unprimeable number, because it can be changed into a prime (3131012123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3305770 + ... + 3306716.

It is an arithmetic number, because the mean of its divisors is an integer number (136936704).

Almost surely, 2^3131012121 is an apocalyptic number.

3131012121 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

3131012121 is a deficient number, since it is larger than the sum of its proper divisors (1250962407).

3131012121 is a wasteful number, since it uses less digits than its factorization.

3131012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 3131012121 is about 55955.4476436388. The cubic root of 3131012121 is about 1462.9458444047.

Adding to 3131012121 its reverse (1212101313), we get a palindrome (4343113434).

The spelling of 3131012121 in words is "three billion, one hundred thirty-one million, twelve thousand, one hundred twenty-one".