31201020101 has 4 divisors (see below), whose sum is σ = 31201625100. Its totient is φ = 31200415104.

The previous prime is 31201020079. The next prime is 31201020143. The reversal of 31201020101 is 10102010213.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14220324001 + 16980696100 = 119249^2 + 130310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31201020101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31201020701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217106 + ... + 330963.

It is an arithmetic number, because the mean of its divisors is an integer number (7800406275).

Almost surely, 2^31201020101 is an apocalyptic number.

It is an amenable number.

31201020101 is a deficient number, since it is larger than the sum of its proper divisors (604999).

31201020101 is an equidigital number, since it uses as much as digits as its factorization.

31201020101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604998.

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31201020101 its reverse (10102010213), we get a palindrome (41303030314).

The spelling of 31201020101 in words is "thirty-one billion, two hundred one million, twenty thousand, one hundred one".