31311231232201 has 4 divisors (see below), whose sum is σ = 31311301959952. Its totient is φ = 31311160504452.

The previous prime is 31311231232147. The next prime is 31311231232313. The reversal of 31311231232201 is 10223213211313.

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 a de Polignac number, because none of the positive numbers 2^k-31311231232201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311231233201) 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, 34695615 + ... + 35586628.

It is an arithmetic number, because the mean of its divisors is an integer number (7827825489988).

Almost surely, 2^{31311231232201} is an apocalyptic number.

It is an amenable number.

31311231232201 is a deficient number, since it is larger than the sum of its proper divisors (70727751).

31311231232201 is an equidigital number, since it uses as much as digits as its factorization.

31311231232201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70727750.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 31311231232201 its reverse (10223213211313), we get a palindrome (41534444443514).

The spelling of 31311231232201 in words is "thirty-one trillion, three hundred eleven billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred one".