42540135431 has 4 divisors (see below), whose sum is σ = 42571120152. Its totient is φ = 42509150712.

The previous prime is 42540135403. The next prime is 42540135457. The reversal of 42540135431 is 13453104524.

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

It is a cyclic number.

It is not a de Polignac number, because 42540135431 - 2³⁴ = 25360266247 is a prime.

It is a super-2 number, since 2×42540135431² (a number of 22 digits) 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 (42540185431) 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, 15490301 + ... + 15493046.

It is an arithmetic number, because the mean of its divisors is an integer number (10642780038).

Almost surely, 2^42540135431 is an apocalyptic number.

42540135431 is a deficient number, since it is larger than the sum of its proper divisors (30984721).

42540135431 is a wasteful number, since it uses less digits than its factorization.

42540135431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30984720.

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 42540135431 its reverse (13453104524), we get a palindrome (55993239955).

The spelling of 42540135431 in words is "forty-two billion, five hundred forty million, one hundred thirty-five thousand, four hundred thirty-one".