31203111301111 has 4 divisors (see below), whose sum is σ = 31340569941432. Its totient is φ = 31065652660792.

The previous prime is 31203111301099. The next prime is 31203111301121. The reversal of 31203111301111 is 11110311130213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31203111301111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31203111301121) 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, 68729319820 + ... + 68729320273.

It is an arithmetic number, because the mean of its divisors is an integer number (7835142485358).

Almost surely, 2^{31203111301111} is an apocalyptic number.

31203111301111 is a deficient number, since it is larger than the sum of its proper divisors (137458640321).

31203111301111 is a wasteful number, since it uses less digits than its factorization.

31203111301111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137458640320.

The product of its (nonzero) digits is 54, while the sum is 19.

Adding to 31203111301111 its reverse (11110311130213), we get a palindrome (42313422431324).

The spelling of 31203111301111 in words is "thirty-one trillion, two hundred three billion, one hundred eleven million, three hundred one thousand, one hundred eleven".