57421561 has 4 divisors (see below), whose sum is σ = 57492324. Its totient is φ = 57350800.

The previous prime is 57421543. The next prime is 57421577. The reversal of 57421561 is 16512475.

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

It can be written as a sum of positive squares in 2 ways, for example, as 10361961 + 47059600 = 3219^2 + 6860^2 .

It is a cyclic number.

It is not a de Polignac number, because 57421561 - 2¹⁹ = 56897273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57421531) 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, 34150 + ... + 35791.

It is an arithmetic number, because the mean of its divisors is an integer number (14373081).

Almost surely, 2^57421561 is an apocalyptic number.

It is an amenable number.

57421561 is a deficient number, since it is larger than the sum of its proper divisors (70763).

57421561 is an equidigital number, since it uses as much as digits as its factorization.

57421561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70762.

The product of its digits is 8400, while the sum is 31.

The square root of 57421561 is about 7577.7015644587. The cubic root of 57421561 is about 385.7965428003.

The spelling of 57421561 in words is "fifty-seven million, four hundred twenty-one thousand, five hundred sixty-one".