42131181 has 4 divisors (see below), whose sum is σ = 56174912. Its totient is φ = 28087452.

The previous prime is 42131161. The next prime is 42131183. The reversal of 42131181 is 18113124.

It is a happy number.

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 not a de Polignac number, because 42131181 - 2¹³ = 42122989 is a prime.

It is a super-2 number, since 2×42131181² = 3550072824909522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42131183) 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, 7021861 + ... + 7021866.

It is an arithmetic number, because the mean of its divisors is an integer number (14043728).

Almost surely, 2^42131181 is an apocalyptic number.

It is an amenable number.

42131181 is a deficient number, since it is larger than the sum of its proper divisors (14043731).

42131181 is a wasteful number, since it uses less digits than its factorization.

42131181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14043730.

The product of its digits is 192, while the sum is 21.

The square root of 42131181 is about 6490.8536418564. The cubic root of 42131181 is about 347.9641841195.

It can be divided in two parts, 421311 and 81, that multiplied together give a triangular number (34126191 = T₈₂₆₁).

The spelling of 42131181 in words is "forty-two million, one hundred thirty-one thousand, one hundred eighty-one".