556155431 has 4 divisors (see below), whose sum is σ = 598936632. Its totient is φ = 513374232.

The previous prime is 556155373. The next prime is 556155451. The reversal of 556155431 is 134551655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 556155431 - 2¹⁸ = 555893287 is a prime.

It is a super-2 number, since 2×556155431² = 618617726861591522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 556155391 and 556155400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556155451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21390581 + ... + 21390606.

It is an arithmetic number, because the mean of its divisors is an integer number (149734158).

Almost surely, 2^556155431 is an apocalyptic number.

556155431 is a deficient number, since it is larger than the sum of its proper divisors (42781201).

556155431 is a wasteful number, since it uses less digits than its factorization.

556155431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42781200.

The product of its digits is 45000, while the sum is 35.

The square root of 556155431 is about 23582.9478861316. The cubic root of 556155431 is about 822.3664690240.

The spelling of 556155431 in words is "five hundred fifty-six million, one hundred fifty-five thousand, four hundred thirty-one".