40071531 has 4 divisors (see below), whose sum is σ = 53428712. Its totient is φ = 26714352.

The previous prime is 40071523. The next prime is 40071553. The reversal of 40071531 is 13517004.

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

It is not a de Polignac number, because 40071531 - 2³ = 40071523 is a prime.

It is a super-4 number, since 4×40071531⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40071498 and 40071507.

It is not an unprimeable number, because it can be changed into a prime (40071331) 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, 6678586 + ... + 6678591.

It is an arithmetic number, because the mean of its divisors is an integer number (13357178).

Almost surely, 2^40071531 is an apocalyptic number.

40071531 is a deficient number, since it is larger than the sum of its proper divisors (13357181).

40071531 is a wasteful number, since it uses less digits than its factorization.

40071531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13357180.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 40071531 is about 6330.2078164939. The cubic root of 40071531 is about 342.1989284188.

Adding to 40071531 its reverse (13517004), we get a palindrome (53588535).

The spelling of 40071531 in words is "forty million, seventy-one thousand, five hundred thirty-one".