555600991 has 16 divisors (see below), whose sum is σ = 623561760. Its totient is φ = 490596480.

The previous prime is 555600989. The next prime is 555601001. The reversal of 555600991 is 199006555.

It is not a de Polignac number, because 555600991 - 2¹ = 555600989 is a prime.

It is a super-2 number, since 2×555600991² = 617384922400364162, 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 (555600901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 434445 + ... + 435721.

It is an arithmetic number, because the mean of its divisors is an integer number (38972610).

Almost surely, 2^555600991 is an apocalyptic number.

555600991 is a deficient number, since it is larger than the sum of its proper divisors (67960769).

555600991 is a wasteful number, since it uses less digits than its factorization.

555600991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394.

The product of its (nonzero) digits is 60750, while the sum is 40.

The square root of 555600991 is about 23571.1898511721. The cubic root of 555600991 is about 822.0931015209.

The spelling of 555600991 in words is "five hundred fifty-five million, six hundred thousand, nine hundred ninety-one".