1231210520 has 32 divisors (see below), whose sum is σ = 2845098000. Its totient is φ = 479173248.

The previous prime is 1231210489. The next prime is 1231210523. The reversal of 1231210520 is 250121321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231210523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 414470 + ... + 417429.

Almost surely, 2^1231210520 is an apocalyptic number.

1231210520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231210520 is an abundant number, since it is smaller than the sum of its proper divisors (1613887480).

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

1231210520 is a wasteful number, since it uses less digits than its factorization.

1231210520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831947 (or 831943 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1231210520 is about 35088.6095478291. The cubic root of 1231210520 is about 1071.7926452549.

Adding to 1231210520 its reverse (250121321), we get a palindrome (1481331841).

The spelling of 1231210520 in words is "one billion, two hundred thirty-one million, two hundred ten thousand, five hundred twenty".