31331123101213 has 16 divisors (see below), whose sum is σ = 35217733009536. Its totient is φ = 27656124724800.

The previous prime is 31331123101207. The next prime is 31331123101219. The reversal of 31331123101213 is 31210132113313.

It is an interprime number because it is at equal distance from previous prime (31331123101207) and next prime (31331123101219).

It is not a de Polignac number, because 31331123101213 - 2⁹ = 31331123100701 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 (31331123101219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13049895 + ... + 15263092.

It is an arithmetic number, because the mean of its divisors is an integer number (2201108313096).

Almost surely, 2^{31331123101213} is an apocalyptic number.

It is an amenable number.

31331123101213 is a deficient number, since it is larger than the sum of its proper divisors (3886609908323).

31331123101213 is a wasteful number, since it uses less digits than its factorization.

31331123101213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28316724.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31331123101213 its reverse (31210132113313), we get a palindrome (62541255214526).

The spelling of 31331123101213 in words is "thirty-one trillion, three hundred thirty-one billion, one hundred twenty-three million, one hundred one thousand, two hundred thirteen".