31011111311 has 4 divisors (see below), whose sum is σ = 31029007512. Its totient is φ = 30993215112.

The previous prime is 31011111293. The next prime is 31011111409. The reversal of 31011111311 is 11311111013.

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-31011111311 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 (31011111211) 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, 8945501 + ... + 8948966.

It is an arithmetic number, because the mean of its divisors is an integer number (7757251878).

Almost surely, 2^31011111311 is an apocalyptic number.

31011111311 is a deficient number, since it is larger than the sum of its proper divisors (17896201).

31011111311 is a wasteful number, since it uses less digits than its factorization.

31011111311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17896200.

The product of its (nonzero) digits is 9, while the sum is 14.

Adding to 31011111311 its reverse (11311111013), we get a palindrome (42322222324).

The spelling of 31011111311 in words is "thirty-one billion, eleven million, one hundred eleven thousand, three hundred eleven".