123531000 has 64 divisors (see below), whose sum is σ = 385426080. Its totient is φ = 32940800.

The previous prime is 123530971. The next prime is 123531011. The reversal of 123531000 is 135321.

It is a happy number.

It is a super-2 number, since 2×123531000² = 30519815922000000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17589 + ... + 23588.

Almost surely, 2^123531000 is an apocalyptic number.

123531000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123531000 is an abundant number, since it is smaller than the sum of its proper divisors (261895080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123531000 is a wasteful number, since it uses less digits than its factorization.

123531000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41201 (or 41187 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 123531000 is about 11114.4500538713. The cubic root of 123531000 is about 498.0336100927.

Adding to 123531000 its reverse (135321), we get a palindrome (123666321).

The spelling of 123531000 in words is "one hundred twenty-three million, five hundred thirty-one thousand".