123542521431 has 32 divisors (see below), whose sum is σ = 199364110848. Its totient is φ = 66431370240.

The previous prime is 123542521409. The next prime is 123542521469. The reversal of 123542521431 is 134125245321.

It is not a de Polignac number, because 123542521431 - 2⁷ = 123542521303 is a prime.

It is a super-2 number, since 2×123542521431² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 123542521392 and 123542521401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123542523431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2243676 + ... + 2298078.

It is an arithmetic number, because the mean of its divisors is an integer number (6230128464).

Almost surely, 2^123542521431 is an apocalyptic number.

123542521431 is a deficient number, since it is larger than the sum of its proper divisors (75821589417).

123542521431 is a wasteful number, since it uses less digits than its factorization.

123542521431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60791.

The product of its digits is 28800, while the sum is 33.

Adding to 123542521431 its reverse (134125245321), we get a palindrome (257667766752).

The spelling of 123542521431 in words is "one hundred twenty-three billion, five hundred forty-two million, five hundred twenty-one thousand, four hundred thirty-one".