1231542210500 has 144 divisors (see below), whose sum is σ = 3264858140544. Its totient is φ = 403884465600.

The previous prime is 1231542210443. The next prime is 1231542210601. The reversal of 1231542210500 is 50122451321.

It is a self number, because there is not a number n which added to its sum of digits gives 1231542210500.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 529262 + ... + 1656261.

It is an arithmetic number, because the mean of its divisors is an integer number (22672625976).

Almost surely, 2^{1231542210500} is an apocalyptic number.

1231542210500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231542210500 is an abundant number, since it is smaller than the sum of its proper divisors (2033315930044).

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

1231542210500 is a wasteful number, since it uses less digits than its factorization.

1231542210500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2185579 (or 2185560 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 1231542210500 its reverse (50122451321), we get a palindrome (1281664661821).

The spelling of 1231542210500 in words is "one trillion, two hundred thirty-one billion, five hundred forty-two million, two hundred ten thousand, five hundred".