511751997 has 12 divisors (see below), whose sum is σ = 751316124. Its totient is φ = 335574720.

The previous prime is 511751993. The next prime is 511752011. The reversal of 511751997 is 799157115.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 202379076 + 309372921 = 14226^2 + 17589^2 .

It is not a de Polignac number, because 511751997 - 2² = 511751993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (511751993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 465528 + ... + 466625.

It is an arithmetic number, because the mean of its divisors is an integer number (62609677).

Almost surely, 2^511751997 is an apocalyptic number.

It is an amenable number.

511751997 is a deficient number, since it is larger than the sum of its proper divisors (239564127).

511751997 is a wasteful number, since it uses less digits than its factorization.

511751997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 932220 (or 932217 counting only the distinct ones).

The product of its digits is 99225, while the sum is 45.

The square root of 511751997 is about 22621.9361903441. The cubic root of 511751997 is about 799.8708109097.

The spelling of 511751997 in words is "five hundred eleven million, seven hundred fifty-one thousand, nine hundred ninety-seven".