42131749 has 4 divisors (see below), whose sum is σ = 45961920. Its totient is φ = 38301580.

The previous prime is 42131743. The next prime is 42131753. The reversal of 42131749 is 94713124.

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 42131749 - 2⁵ = 42131717 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 self number, because there is not a number n which added to its sum of digits gives 42131749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131743) 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, 1915069 + ... + 1915090.

It is an arithmetic number, because the mean of its divisors is an integer number (11490480).

Almost surely, 2^42131749 is an apocalyptic number.

It is an amenable number.

42131749 is a deficient number, since it is larger than the sum of its proper divisors (3830171).

42131749 is a wasteful number, since it uses less digits than its factorization.

42131749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3830170.

The product of its digits is 6048, while the sum is 31.

The square root of 42131749 is about 6490.8973955841. The cubic root of 42131749 is about 347.9657478289.

The spelling of 42131749 in words is "forty-two million, one hundred thirty-one thousand, seven hundred forty-nine".