57042409 has 4 divisors (see below), whose sum is σ = 57093120. Its totient is φ = 56991700.

The previous prime is 57042407. The next prime is 57042421. The reversal of 57042409 is 90424075.

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 a cyclic number.

It is not a de Polignac number, because 57042409 - 2¹ = 57042407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57042407) 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, 23629 + ... + 25930.

It is an arithmetic number, because the mean of its divisors is an integer number (14273280).

Almost surely, 2^57042409 is an apocalyptic number.

It is an amenable number.

57042409 is a deficient number, since it is larger than the sum of its proper divisors (50711).

57042409 is a wasteful number, since it uses less digits than its factorization.

57042409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50710.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 57042409 is about 7552.6425176888. The cubic root of 57042409 is about 384.9455345452.

The spelling of 57042409 in words is "fifty-seven million, forty-two thousand, four hundred nine".