40831081 has 4 divisors (see below), whose sum is σ = 41192532. Its totient is φ = 40469632.

The previous prime is 40831079. The next prime is 40831099. The reversal of 40831081 is 18013804.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 39576681 = 1120^2 + 6291^2 .

It is a cyclic number.

It is not a de Polignac number, because 40831081 - 2¹ = 40831079 is a prime.

It is a super-2 number, since 2×40831081² = 3334354351257122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40831001) 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, 180556 + ... + 180781.

It is an arithmetic number, because the mean of its divisors is an integer number (10298133).

Almost surely, 2^40831081 is an apocalyptic number.

It is an amenable number.

40831081 is a deficient number, since it is larger than the sum of its proper divisors (361451).

40831081 is a wasteful number, since it uses less digits than its factorization.

40831081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361450.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 40831081 is about 6389.9202655432. The cubic root of 40831081 is about 344.3475198400.

Adding to 40831081 its reverse (18013804), we get a palindrome (58844885).

The spelling of 40831081 in words is "forty million, eight hundred thirty-one thousand, eighty-one".