42149091 has 4 divisors (see below), whose sum is σ = 56198792. Its totient is φ = 28099392.

The previous prime is 42149089. The next prime is 42149099. The reversal of 42149091 is 19094124.

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

It is not a de Polignac number, because 42149091 - 2¹ = 42149089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42149099) 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, 7024846 + ... + 7024851.

It is an arithmetic number, because the mean of its divisors is an integer number (14049698).

Almost surely, 2^42149091 is an apocalyptic number.

42149091 is a deficient number, since it is larger than the sum of its proper divisors (14049701).

42149091 is a wasteful number, since it uses less digits than its factorization.

42149091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14049700.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 42149091 is about 6492.2331289010. The cubic root of 42149091 is about 348.0134837555.

The spelling of 42149091 in words is "forty-two million, one hundred forty-nine thousand, ninety-one".