31111213117 has 2 divisors, whose sum is σ = 31111213118. Its totient is φ = 31111213116.

The previous prime is 31111213099. The next prime is 31111213153. The reversal of 31111213117 is 71131211113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20167124121 + 10944088996 = 142011^2 + 104614^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111213117 - 2⁷ = 31111212989 is a prime.

It is a super-2 number, since 2×31111213117² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31111214117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555606558 + 15555606559.

It is an arithmetic number, because the mean of its divisors is an integer number (15555606559).

Almost surely, 2^31111213117 is an apocalyptic number.

It is an amenable number.

31111213117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111213117 is an equidigital number, since it uses as much as digits as its factorization.

31111213117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 126, while the sum is 22.

The spelling of 31111213117 in words is "thirty-one billion, one hundred eleven million, two hundred thirteen thousand, one hundred seventeen".