40991671 has 8 divisors (see below), whose sum is σ = 48114080. Its totient is φ = 34185888.

The previous prime is 40991651. The next prime is 40991689. The reversal of 40991671 is 17619904.

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

It is a cyclic number.

It is not a de Polignac number, because 40991671 - 2¹³ = 40983479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a self number, because there is not a number n which added to its sum of digits gives 40991671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40991651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78876 + ... + 79393.

It is an arithmetic number, because the mean of its divisors is an integer number (6014260).

Almost surely, 2^40991671 is an apocalyptic number.

40991671 is a deficient number, since it is larger than the sum of its proper divisors (7122409).

40991671 is a wasteful number, since it uses less digits than its factorization.

40991671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158313.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 40991671 is about 6402.4738187672. The cubic root of 40991671 is about 344.7983726997.

The spelling of 40991671 in words is "forty million, nine hundred ninety-one thousand, six hundred seventy-one".