557425821 has 4 divisors (see below), whose sum is σ = 743234432. Its totient is φ = 371617212.

The previous prime is 557425807. The next prime is 557425823. The reversal of 557425821 is 128524755.

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.

It is not a de Polignac number, because 557425821 - 2¹³ = 557417629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 557425821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557425823) 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, 92904301 + ... + 92904306.

It is an arithmetic number, because the mean of its divisors is an integer number (185808608).

Almost surely, 2^557425821 is an apocalyptic number.

It is an amenable number.

557425821 is a deficient number, since it is larger than the sum of its proper divisors (185808611).

557425821 is a wasteful number, since it uses less digits than its factorization.

557425821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185808610.

The product of its digits is 112000, while the sum is 39.

The square root of 557425821 is about 23609.8670263091. The cubic root of 557425821 is about 822.9921524340.

The spelling of 557425821 in words is "five hundred fifty-seven million, four hundred twenty-five thousand, eight hundred twenty-one".