123245531 has 4 divisors (see below), whose sum is σ = 123268632. Its totient is φ = 123222432.

The previous prime is 123245527. The next prime is 123245539. The reversal of 123245531 is 135542321.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135542321 = 43 ⋅3152147.

It is a cyclic number.

It is not a de Polignac number, because 123245531 - 2² = 123245527 is a prime.

It is a super-2 number, since 2×123245531² = 30378921822943922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123245531.

It is not an unprimeable number, because it can be changed into a prime (123245539) 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, 995 + ... + 15731.

It is an arithmetic number, because the mean of its divisors is an integer number (30817158).

Almost surely, 2^123245531 is an apocalyptic number.

123245531 is a deficient number, since it is larger than the sum of its proper divisors (23101).

123245531 is an equidigital number, since it uses as much as digits as its factorization.

123245531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23100.

The product of its digits is 3600, while the sum is 26.

The square root of 123245531 is about 11101.6003801254. The cubic root of 123245531 is about 497.6496772772.

Adding to 123245531 its reverse (135542321), we get a palindrome (258787852).

The spelling of 123245531 in words is "one hundred twenty-three million, two hundred forty-five thousand, five hundred thirty-one".