501231355140 has 48 divisors (see below), whose sum is σ = 1429927950528. Its totient is φ = 131139775104.

The previous prime is 501231355127. The next prime is 501231355147. The reversal of 501231355140 is 41553132105.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 501231355098 and 501231355107.

It is not an unprimeable number, because it can be changed into a prime (501231355147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78806782 + ... + 78813141.

It is an arithmetic number, because the mean of its divisors is an integer number (29790165636).

Almost surely, 2^501231355140 is an apocalyptic number.

It is an amenable number.

501231355140 is an abundant number, since it is smaller than the sum of its proper divisors (928696595388).

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

501231355140 is a wasteful number, since it uses less digits than its factorization.

501231355140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157619988 (or 157619986 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 501231355140 its reverse (41553132105), we get a palindrome (542784487245).

The spelling of 501231355140 in words is "five hundred one billion, two hundred thirty-one million, three hundred fifty-five thousand, one hundred forty".