556501421 has 4 divisors (see below), whose sum is σ = 636001632. Its totient is φ = 477001212.

The previous prime is 556501403. The next prime is 556501459. The reversal of 556501421 is 124105655.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124105655 = 5 ⋅24821131.

It is a cyclic number.

It is not a de Polignac number, because 556501421 - 2⁶ = 556501357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556501021) 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, 39750095 + ... + 39750108.

It is an arithmetic number, because the mean of its divisors is an integer number (159000408).

Almost surely, 2^556501421 is an apocalyptic number.

It is an amenable number.

556501421 is a deficient number, since it is larger than the sum of its proper divisors (79500211).

556501421 is an equidigital number, since it uses as much as digits as its factorization.

556501421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79500210.

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 556501421 is about 23590.2823425240. The cubic root of 556501421 is about 822.5369678786.

The spelling of 556501421 in words is "five hundred fifty-six million, five hundred one thousand, four hundred twenty-one".