42101579 has 4 divisors (see below), whose sum is σ = 45340176. Its totient is φ = 38862984.

The previous prime is 42101573. The next prime is 42101617. The reversal of 42101579 is 97510124.

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 42101579 - 2²⁴ = 25324363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42101573) 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, 1619279 + ... + 1619304.

It is an arithmetic number, because the mean of its divisors is an integer number (11335044).

Almost surely, 2^42101579 is an apocalyptic number.

42101579 is a deficient number, since it is larger than the sum of its proper divisors (3238597).

42101579 is a wasteful number, since it uses less digits than its factorization.

42101579 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3238596.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 42101579 is about 6488.5729555889. The cubic root of 42101579 is about 347.8826700731.

The spelling of 42101579 in words is "forty-two million, one hundred one thousand, five hundred seventy-nine".