42249541 has 4 divisors (see below), whose sum is σ = 42493932. Its totient is φ = 42005152.

The previous prime is 42249517. The next prime is 42249547. The reversal of 42249541 is 14594224.

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 39325441 + 2924100 = 6271^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 42249541 - 2¹³ = 42241349 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42249547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121936 + ... + 122281.

It is an arithmetic number, because the mean of its divisors is an integer number (10623483).

Almost surely, 2^42249541 is an apocalyptic number.

It is an amenable number.

42249541 is a deficient number, since it is larger than the sum of its proper divisors (244391).

42249541 is a wasteful number, since it uses less digits than its factorization.

42249541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244390.

The product of its digits is 11520, while the sum is 31.

The square root of 42249541 is about 6499.9646922118. The cubic root of 42249541 is about 348.2897271228.

The spelling of 42249541 in words is "forty-two million, two hundred forty-nine thousand, five hundred forty-one".