31131023220101 has 32 divisors (see below), whose sum is σ = 35792055011328. Its totient is φ = 26523824025600.

The previous prime is 31131023220067. The next prime is 31131023220109. The reversal of 31131023220101 is 10102232013113.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31131023220101 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 (31131023220109) 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, 3144225251 + ... + 3144235151.

It is an arithmetic number, because the mean of its divisors is an integer number (1118501719104).

Almost surely, 2^{31131023220101} is an apocalyptic number.

It is an amenable number.

31131023220101 is a deficient number, since it is larger than the sum of its proper divisors (4661031791227).

31131023220101 is a wasteful number, since it uses less digits than its factorization.

31131023220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31131023220101 its reverse (10102232013113), we get a palindrome (41233255233214).

The spelling of 31131023220101 in words is "thirty-one trillion, one hundred thirty-one billion, twenty-three million, two hundred twenty thousand, one hundred one".