31430011211 has 4 divisors (see below), whose sum is σ = 31430576712. Its totient is φ = 31429445712.

The previous prime is 31430011183. The next prime is 31430011219. The reversal of 31430011211 is 11211003413.

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 31430011211 - 2²² = 31425816907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31430011211.

It is not an unprimeable number, because it can be changed into a prime (31430011219) 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, 189026 + ... + 313991.

It is an arithmetic number, because the mean of its divisors is an integer number (7857644178).

Almost surely, 2^31430011211 is an apocalyptic number.

31430011211 is a deficient number, since it is larger than the sum of its proper divisors (565501).

31430011211 is an equidigital number, since it uses as much as digits as its factorization.

31430011211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565500.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 31430011211 its reverse (11211003413), we get a palindrome (42641014624).

The spelling of 31430011211 in words is "thirty-one billion, four hundred thirty million, eleven thousand, two hundred eleven".