31320020201 has 4 divisors (see below), whose sum is σ = 31353094032. Its totient is φ = 31286946372.

The previous prime is 31320020191. The next prime is 31320020219. The reversal of 31320020201 is 10202002313.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31320020201 - 2²⁶ = 31252911337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31320220201) 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, 16535495 + ... + 16537388.

It is an arithmetic number, because the mean of its divisors is an integer number (7838273508).

Almost surely, 2^31320020201 is an apocalyptic number.

It is an amenable number.

31320020201 is a deficient number, since it is larger than the sum of its proper divisors (33073831).

31320020201 is an equidigital number, since it uses as much as digits as its factorization.

31320020201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33073830.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 31320020201 its reverse (10202002313), we get a palindrome (41522022514).

The spelling of 31320020201 in words is "thirty-one billion, three hundred twenty million, twenty thousand, two hundred one".