556771961 has 8 divisors (see below), whose sum is σ = 558840384. Its totient is φ = 554708560.

The previous prime is 556771933. The next prime is 556771987. The reversal of 556771961 is 169177655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 556771961 - 2¹⁰ = 556770937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556771931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 539516 + ... + 540546.

It is an arithmetic number, because the mean of its divisors is an integer number (69855048).

Almost surely, 2^556771961 is an apocalyptic number.

It is an amenable number.

556771961 is a deficient number, since it is larger than the sum of its proper divisors (2068423).

556771961 is a wasteful number, since it uses less digits than its factorization.

556771961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511.

The product of its digits is 396900, while the sum is 47.

The square root of 556771961 is about 23596.0157865687. The cubic root of 556771961 is about 822.6702368409.

The spelling of 556771961 in words is "five hundred fifty-six million, seven hundred seventy-one thousand, nine hundred sixty-one".