122143642531 has 4 divisors (see below), whose sum is σ = 126083760064. Its totient is φ = 118203525000.

The previous prime is 122143642529. The next prime is 122143642549. The reversal of 122143642531 is 135246341221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135246341221 = 911 ⋅148459211.

It is a cyclic number.

It is not a de Polignac number, because 122143642531 - 2¹ = 122143642529 is a prime.

It is a super-2 number, since 2×122143642531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (122143642501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1970058720 + ... + 1970058781.

It is an arithmetic number, because the mean of its divisors is an integer number (31520940016).

Almost surely, 2^122143642531 is an apocalyptic number.

122143642531 is a deficient number, since it is larger than the sum of its proper divisors (3940117533).

122143642531 is an equidigital number, since it uses as much as digits as its factorization.

122143642531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3940117532.

The product of its digits is 34560, while the sum is 34.

Adding to 122143642531 its reverse (135246341221), we get a palindrome (257389983752).

The spelling of 122143642531 in words is "one hundred twenty-two billion, one hundred forty-three million, six hundred forty-two thousand, five hundred thirty-one".