516961591 has 4 divisors (see below), whose sum is σ = 517007232. Its totient is φ = 516915952.

The previous prime is 516961583. The next prime is 516961649. The reversal of 516961591 is 195169615.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 516961591 - 2³ = 516961583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516961561) 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, 8490 + ... + 33256.

It is an arithmetic number, because the mean of its divisors is an integer number (129251808).

Almost surely, 2^516961591 is an apocalyptic number.

516961591 is a deficient number, since it is larger than the sum of its proper divisors (45641).

516961591 is a wasteful number, since it uses less digits than its factorization.

516961591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45640.

The product of its digits is 72900, while the sum is 43.

The square root of 516961591 is about 22736.7893731723. The cubic root of 516961591 is about 802.5758592639.

The spelling of 516961591 in words is "five hundred sixteen million, nine hundred sixty-one thousand, five hundred ninety-one".