31220232101 has 2 divisors, whose sum is σ = 31220232102. Its totient is φ = 31220232100.

The previous prime is 31220232077. The next prime is 31220232107. The reversal of 31220232101 is 10123202213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29479173025 + 1741059076 = 171695^2 + 41726^2 .

It is an emirp because it is prime and its reverse (10123202213) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31220232101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31220232101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31220232107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15610116050 + 15610116051.

It is an arithmetic number, because the mean of its divisors is an integer number (15610116051).

Almost surely, 2^31220232101 is an apocalyptic number.

It is an amenable number.

31220232101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31220232101 is an equidigital number, since it uses as much as digits as its factorization.

31220232101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 31220232101 its reverse (10123202213), we get a palindrome (41343434314).

The spelling of 31220232101 in words is "thirty-one billion, two hundred twenty million, two hundred thirty-two thousand, one hundred one".