511261988 has 12 divisors (see below), whose sum is σ = 896095872. Its totient is φ = 255234600.

The previous prime is 511261987. The next prime is 511261999. The reversal of 511261988 is 889162115.

It is a super-2 number, since 2×511261988² = 522777640747424288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (511261981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96188 + ... + 101363.

It is an arithmetic number, because the mean of its divisors is an integer number (74674656).

Almost surely, 2^511261988 is an apocalyptic number.

It is an amenable number.

511261988 is a deficient number, since it is larger than the sum of its proper divisors (384833884).

511261988 is a wasteful number, since it uses less digits than its factorization.

511261988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198202 (or 198200 counting only the distinct ones).

The product of its digits is 34560, while the sum is 41.

The square root of 511261988 is about 22611.1032017458. The cubic root of 511261988 is about 799.6154339158.

The spelling of 511261988 in words is "five hundred eleven million, two hundred sixty-one thousand, nine hundred eighty-eight".