31200320011 has 4 divisors (see below), whose sum is σ = 35657508592. Its totient is φ = 26743131432.

The previous prime is 31200319981. The next prime is 31200320089. The reversal of 31200320011 is 11002300213.

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

It is a cyclic number.

It is not a de Polignac number, because 31200320011 - 2⁷ = 31200319883 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200319973 and 31200320000.

It is not an unprimeable number, because it can be changed into a prime (31200329011) 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, 2228594280 + ... + 2228594293.

It is an arithmetic number, because the mean of its divisors is an integer number (8914377148).

Almost surely, 2^31200320011 is an apocalyptic number.

31200320011 is a deficient number, since it is larger than the sum of its proper divisors (4457188581).

31200320011 is an equidigital number, since it uses as much as digits as its factorization.

31200320011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4457188580.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 31200320011 its reverse (11002300213), we get a palindrome (42202620224).

The spelling of 31200320011 in words is "thirty-one billion, two hundred million, three hundred twenty thousand, eleven".