512121997 has 4 divisors (see below), whose sum is σ = 514803456. Its totient is φ = 509440540.

The previous prime is 512121983. The next prime is 512122019. The reversal of 512121997 is 799121215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-512121997 is a prime.

It is a super-2 number, since 2×512121997² = 524537879622536018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (512121977) 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, 1340443 + ... + 1340824.

It is an arithmetic number, because the mean of its divisors is an integer number (128700864).

Almost surely, 2^512121997 is an apocalyptic number.

It is an amenable number.

512121997 is a deficient number, since it is larger than the sum of its proper divisors (2681459).

512121997 is a wasteful number, since it uses less digits than its factorization.

512121997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681458.

The product of its digits is 11340, while the sum is 37.

The square root of 512121997 is about 22630.1126157163. The cubic root of 512121997 is about 800.0635350582.

The spelling of 512121997 in words is "five hundred twelve million, one hundred twenty-one thousand, nine hundred ninety-seven".