511515251242 has 32 divisors (see below), whose sum is σ = 836177195520. Its totient is φ = 233769818880.

The previous prime is 511515251237. The next prime is 511515251243. The reversal of 511515251242 is 242152515115.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 511515251198 and 511515251207.

It is not an unprimeable number, because it can be changed into a prime (511515251243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1397118 + ... + 1724809.

It is an arithmetic number, because the mean of its divisors is an integer number (26130537360).

Almost surely, 2^511515251242 is an apocalyptic number.

511515251242 is a deficient number, since it is larger than the sum of its proper divisors (324661944278).

511515251242 is a wasteful number, since it uses less digits than its factorization.

511515251242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122086.

The product of its digits is 20000, while the sum is 34.

Adding to 511515251242 its reverse (242152515115), we get a palindrome (753667766357).

The spelling of 511515251242 in words is "five hundred eleven billion, five hundred fifteen million, two hundred fifty-one thousand, two hundred forty-two".