126123131 has 2 divisors, whose sum is σ = 126123132. Its totient is φ = 126123130.

The previous prime is 126123113. The next prime is 126123139. The reversal of 126123131 is 131321621.

Together with previous prime (126123113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 126123131 - 2²² = 121928827 is a prime.

It is a super-2 number, since 2×126123131² = 31814088346486322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (126123139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63061565 + 63061566.

It is an arithmetic number, because the mean of its divisors is an integer number (63061566).

Almost surely, 2^126123131 is an apocalyptic number.

126123131 is a deficient number, since it is larger than the sum of its proper divisors (1).

126123131 is an equidigital number, since it uses as much as digits as its factorization.

126123131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 20.

The square root of 126123131 is about 11230.4555116878. The cubic root of 126123131 is about 501.4930451944.

Adding to 126123131 its reverse (131321621), we get a palindrome (257444752).

The spelling of 126123131 in words is "one hundred twenty-six million, one hundred twenty-three thousand, one hundred thirty-one".