3131223101 has 4 divisors (see below), whose sum is σ = 3138015804. Its totient is φ = 3124430400.

The previous prime is 3131223097. The next prime is 3131223167. The reversal of 3131223101 is 1013221313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1013221313 = 13 ⋅77940101.

It can be written as a sum of positive squares in 2 ways, for example, as 453264100 + 2677959001 = 21290^2 + 51749^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131223101 - 2² = 3131223097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3131223101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131213101) 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 3 ways as a sum of consecutive naturals, for example, 3395660 + ... + 3396581.

It is an arithmetic number, because the mean of its divisors is an integer number (784503951).

Almost surely, 2^3131223101 is an apocalyptic number.

It is an amenable number.

3131223101 is a deficient number, since it is larger than the sum of its proper divisors (6792703).

3131223101 is an equidigital number, since it uses as much as digits as its factorization.

3131223101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6792702.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3131223101 is about 55957.3328617439. The cubic root of 3131223101 is about 1462.9787033621.

Adding to 3131223101 its reverse (1013221313), we get a palindrome (4144444414).

The spelling of 3131223101 in words is "three billion, one hundred thirty-one million, two hundred twenty-three thousand, one hundred one".