42131645 has 16 divisors (see below), whose sum is σ = 53758080. Its totient is φ = 31608000.

The previous prime is 42131623. The next prime is 42131657. The reversal of 42131645 is 54613124.

It is not a de Polignac number, because 42131645 - 2²⁰ = 41083069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7400 + ... + 11790.

It is an arithmetic number, because the mean of its divisors is an integer number (3359880).

Almost surely, 2^42131645 is an apocalyptic number.

It is an amenable number.

42131645 is a deficient number, since it is larger than the sum of its proper divisors (11626435).

42131645 is a wasteful number, since it uses less digits than its factorization.

42131645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4516.

The product of its digits is 2880, while the sum is 26.

The square root of 42131645 is about 6490.8893843602. The cubic root of 42131645 is about 347.9654615170.

Adding to 42131645 its reverse (54613124), we get a palindrome (96744769).

The spelling of 42131645 in words is "forty-two million, one hundred thirty-one thousand, six hundred forty-five".