516620121 has 4 divisors (see below), whose sum is σ = 688826832. Its totient is φ = 344413412.

The previous prime is 516620113. The next prime is 516620161. The reversal of 516620121 is 121026615.

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 not a de Polignac number, because 516620121 - 2³ = 516620113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 516620091 and 516620100.

It is not an unprimeable number, because it can be changed into a prime (516620161) 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, 86103351 + ... + 86103356.

It is an arithmetic number, because the mean of its divisors is an integer number (172206708).

Almost surely, 2^516620121 is an apocalyptic number.

It is an amenable number.

516620121 is a deficient number, since it is larger than the sum of its proper divisors (172206711).

516620121 is a wasteful number, since it uses less digits than its factorization.

516620121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172206710.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 516620121 is about 22729.2789370891. The cubic root of 516620121 is about 802.3991111609.

Adding to 516620121 its reverse (121026615), we get a palindrome (637646736).

The spelling of 516620121 in words is "five hundred sixteen million, six hundred twenty thousand, one hundred twenty-one".