123015212131 has 32 divisors (see below), whose sum is σ = 152956943360. Its totient is φ = 96572601216.

The previous prime is 123015212123. The next prime is 123015212137. The reversal of 123015212131 is 131212510321.

It is not a de Polignac number, because 123015212131 - 2³ = 123015212123 is a prime.

It is a super-2 number, since 2×123015212131² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123015212137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 692986 + ... + 852208.

It is an arithmetic number, because the mean of its divisors is an integer number (4779904480).

Almost surely, 2^123015212131 is an apocalyptic number.

123015212131 is a deficient number, since it is larger than the sum of its proper divisors (29941731229).

123015212131 is a wasteful number, since it uses less digits than its factorization.

123015212131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159443.

The product of its (nonzero) digits is 360, while the sum is 22.

Adding to 123015212131 its reverse (131212510321), we get a palindrome (254227722452).

The spelling of 123015212131 in words is "one hundred twenty-three billion, fifteen million, two hundred twelve thousand, one hundred thirty-one".