40001045531 has 4 divisors (see below), whose sum is σ = 40172724072. Its totient is φ = 39829366992.

The previous prime is 40001045527. The next prime is 40001045551. The reversal of 40001045531 is 13554010004.

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 40001045531 - 2² = 40001045527 is a prime.

It is a super-2 number, since 2×40001045531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40001045497 and 40001045506.

It is not an unprimeable number, because it can be changed into a prime (40001045501) 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, 85838921 + ... + 85839386.

It is an arithmetic number, because the mean of its divisors is an integer number (10043181018).

Almost surely, 2^40001045531 is an apocalyptic number.

40001045531 is a deficient number, since it is larger than the sum of its proper divisors (171678541).

40001045531 is a wasteful number, since it uses less digits than its factorization.

40001045531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171678540.

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 40001045531 its reverse (13554010004), we get a palindrome (53555055535).

The spelling of 40001045531 in words is "forty billion, one million, forty-five thousand, five hundred thirty-one".