511031406121 has 2 divisors, whose sum is σ = 511031406122. Its totient is φ = 511031406120.

The previous prime is 511031406091. The next prime is 511031406191. The reversal of 511031406121 is 121604130115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 310516417600 + 200514988521 = 557240^2 + 447789^2 .

It is a cyclic number.

It is not a de Polignac number, because 511031406121 - 2⁵ = 511031406089 is a prime.

It is a super-2 number, since 2×511031406121² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (511031406191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255515703060 + 255515703061.

It is an arithmetic number, because the mean of its divisors is an integer number (255515703061).

Almost surely, 2^511031406121 is an apocalyptic number.

It is an amenable number.

511031406121 is a deficient number, since it is larger than the sum of its proper divisors (1).

511031406121 is an equidigital number, since it uses as much as digits as its factorization.

511031406121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

Adding to 511031406121 its reverse (121604130115), we get a palindrome (632635536236).

The spelling of 511031406121 in words is "five hundred eleven billion, thirty-one million, four hundred six thousand, one hundred twenty-one".