40891631 has 8 divisors (see below), whose sum is σ = 46548864. Its totient is φ = 35557720.

The previous prime is 40891621. The next prime is 40891639. The reversal of 40891631 is 13619804.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40891631 - 2¹⁰ = 40890607 is a prime.

It is a super-2 number, since 2×40891631² = 3344250971680322, which 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 (40891639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80561 + ... + 81066.

It is an arithmetic number, because the mean of its divisors is an integer number (5818608).

Almost surely, 2^40891631 is an apocalyptic number.

40891631 is a deficient number, since it is larger than the sum of its proper divisors (5657233).

40891631 is a wasteful number, since it uses less digits than its factorization.

40891631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161661.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 40891631 is about 6394.6564411233. The cubic root of 40891631 is about 344.5176512183.

The spelling of 40891631 in words is "forty million, eight hundred ninety-one thousand, six hundred thirty-one".