511213231604 has 6 divisors (see below), whose sum is σ = 894623155314. Its totient is φ = 255606615800.

The previous prime is 511213231603. The next prime is 511213231609. The reversal of 511213231604 is 406132312115.

It can be written as a sum of positive squares in only one way, i.e., 423798396004 + 87414835600 = 650998^2 + 295660^2 .

It is a super-2 number, since 2×511213231604² (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 (511213231603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63901653947 + ... + 63901653954.

It is an arithmetic number, because the mean of its divisors is an integer number (149103859219).

Almost surely, 2^511213231604 is an apocalyptic number.

It is an amenable number.

511213231604 is a deficient number, since it is larger than the sum of its proper divisors (383409923710).

511213231604 is a wasteful number, since it uses less digits than its factorization.

511213231604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127803307905 (or 127803307903 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 511213231604 its reverse (406132312115), we get a palindrome (917345543719).

The spelling of 511213231604 in words is "five hundred eleven billion, two hundred thirteen million, two hundred thirty-one thousand, six hundred four".