123142531 has 2 divisors, whose sum is σ = 123142532. Its totient is φ = 123142530.

The previous prime is 123142519. The next prime is 123142559. The reversal of 123142531 is 135241321.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123142531 - 2¹³ = 123134339 is a prime.

It is a super-2 number, since 2×123142531² = 30328165882171922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123142501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61571265 + 61571266.

It is an arithmetic number, because the mean of its divisors is an integer number (61571266).

Almost surely, 2^123142531 is an apocalyptic number.

123142531 is a deficient number, since it is larger than the sum of its proper divisors (1).

123142531 is an equidigital number, since it uses as much as digits as its factorization.

123142531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 123142531 is about 11096.9604396880. The cubic root of 123142531 is about 497.5110050342.

Adding to 123142531 its reverse (135241321), we get a palindrome (258383852).

The spelling of 123142531 in words is "one hundred twenty-three million, one hundred forty-two thousand, five hundred thirty-one".