42001431531 has 16 divisors (see below), whose sum is σ = 61874233344. Its totient is φ = 25208019584.

The previous prime is 42001431509. The next prime is 42001431541. The reversal of 42001431531 is 13513410024.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42001431531 - 2⁵ = 42001431499 is a prime.

It is a super-2 number, since 2×42001431531² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42001431541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17902251 + ... + 17904596.

It is an arithmetic number, because the mean of its divisors is an integer number (3867139584).

Almost surely, 2^42001431531 is an apocalyptic number.

42001431531 is a deficient number, since it is larger than the sum of its proper divisors (19872801813).

42001431531 is a wasteful number, since it uses less digits than its factorization.

42001431531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35806890.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 42001431531 its reverse (13513410024), we get a palindrome (55514841555).

The spelling of 42001431531 in words is "forty-two billion, one million, four hundred thirty-one thousand, five hundred thirty-one".