511203123231 has 4 divisors (see below), whose sum is σ = 681604164312. Its totient is φ = 340802082152.

The previous prime is 511203123163. The next prime is 511203123239. The reversal of 511203123231 is 132321302115.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 511203123231 - 2¹⁷ = 511202992159 is a prime.

It is a super-2 number, since 2×511203123231² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511203123239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85200520536 + ... + 85200520541.

It is an arithmetic number, because the mean of its divisors is an integer number (170401041078).

Almost surely, 2^511203123231 is an apocalyptic number.

511203123231 is a deficient number, since it is larger than the sum of its proper divisors (170401041081).

511203123231 is a wasteful number, since it uses less digits than its factorization.

511203123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170401041080.

The product of its (nonzero) digits is 1080, while the sum is 24.

Adding to 511203123231 its reverse (132321302115), we get a palindrome (643524425346).

The spelling of 511203123231 in words is "five hundred eleven billion, two hundred three million, one hundred twenty-three thousand, two hundred thirty-one".