31200012011 has 6 divisors (see below), whose sum is σ = 36293891580. Its totient is φ = 26742867396.

The previous prime is 31200011981. The next prime is 31200012029. The reversal of 31200012011 is 11021000213.

It is a de Polignac number, because none of the positive numbers 2^k-31200012011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31200011983 and 31200012001.

It is not an unprimeable number, because it can be changed into a prime (31200012611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 318367421 + ... + 318367518.

It is an arithmetic number, because the mean of its divisors is an integer number (6048981930).

Almost surely, 2^31200012011 is an apocalyptic number.

31200012011 is a deficient number, since it is larger than the sum of its proper divisors (5093879569).

31200012011 is an equidigital number, since it uses as much as digits as its factorization.

31200012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636734953 (or 636734946 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 31200012011 its reverse (11021000213), we get a palindrome (42221012224).

The spelling of 31200012011 in words is "thirty-one billion, two hundred million, twelve thousand, eleven".