42149691 has 12 divisors (see below), whose sum is σ = 61020960. Its totient is φ = 28036080.

The previous prime is 42149669. The next prime is 42149693. The reversal of 42149691 is 19694124.

It is a happy number.

42149691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42149691 - 2¹³ = 42141499 is a prime.

It is a super-4 number, since 4×42149691⁴ (a number of 32 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (42149693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 931 + ... + 9228.

It is an arithmetic number, because the mean of its divisors is an integer number (5085080).

Almost surely, 2^42149691 is an apocalyptic number.

42149691 is a deficient number, since it is larger than the sum of its proper divisors (18871269).

42149691 is a wasteful number, since it uses less digits than its factorization.

42149691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10626 (or 10623 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 42149691 is about 6492.2793377981. The cubic root of 42149691 is about 348.0151350928.

The spelling of 42149691 in words is "forty-two million, one hundred forty-nine thousand, six hundred ninety-one".