123017131 has 2 divisors, whose sum is σ = 123017132. Its totient is φ = 123017130.

The previous prime is 123017129. The next prime is 123017137. The reversal of 123017131 is 131710321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123017131 - 2¹ = 123017129 is a prime.

It is a super-2 number, since 2×123017131² = 30266429038942322, which contains 22 as substring.

Together with 123017129, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 123017099 and 123017108.

It is not a weakly prime, because it can be changed into another prime (123017137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61508565 + 61508566.

It is an arithmetic number, because the mean of its divisors is an integer number (61508566).

Almost surely, 2^123017131 is an apocalyptic number.

123017131 is a deficient number, since it is larger than the sum of its proper divisors (1).

123017131 is an equidigital number, since it uses as much as digits as its factorization.

123017131 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126, while the sum is 19.

The square root of 123017131 is about 11091.3088046452. The cubic root of 123017131 is about 497.3420705247.

Adding to 123017131 its reverse (131710321), we get a palindrome (254727452).

The spelling of 123017131 in words is "one hundred twenty-three million, seventeen thousand, one hundred thirty-one".