31200312011 has 4 divisors (see below), whose sum is σ = 34036704024. Its totient is φ = 28363920000.

The previous prime is 31200311981. The next prime is 31200312023. The reversal of 31200312011 is 11021300213.

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-31200312011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31200312071) 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, 1418195990 + ... + 1418196011.

It is an arithmetic number, because the mean of its divisors is an integer number (8509176006).

Almost surely, 2^31200312011 is an apocalyptic number.

31200312011 is a deficient number, since it is larger than the sum of its proper divisors (2836392013).

31200312011 is a wasteful number, since it uses less digits than its factorization.

31200312011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836392012.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 31200312011 its reverse (11021300213), we get a palindrome (42221612224).

The spelling of 31200312011 in words is "thirty-one billion, two hundred million, three hundred twelve thousand, eleven".