31142117 has 2 divisors, whose sum is σ = 31142118. Its totient is φ = 31142116.

The previous prime is 31142101. The next prime is 31142119. The reversal of 31142117 is 71124113.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30625156 + 516961 = 5534^2 + 719^2 .

It is a cyclic number.

It is not a de Polignac number, because 31142117 - 2⁴ = 31142101 is a prime.

Together with 31142119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31142119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571058 + 15571059.

It is an arithmetic number, because the mean of its divisors is an integer number (15571059).

Almost surely, 2^31142117 is an apocalyptic number.

It is an amenable number.

31142117 is a deficient number, since it is larger than the sum of its proper divisors (1).

31142117 is an equidigital number, since it uses as much as digits as its factorization.

31142117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 168, while the sum is 20.

The square root of 31142117 is about 5580.5122524729. The cubic root of 31142117 is about 314.6173803985.

The spelling of 31142117 in words is "thirty-one million, one hundred forty-two thousand, one hundred seventeen".