40535491 has 2 divisors, whose sum is σ = 40535492. Its totient is φ = 40535490.

The previous prime is 40535489. The next prime is 40535501. The reversal of 40535491 is 19453504.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40535491 - 2¹ = 40535489 is a prime.

It is a super-2 number, since 2×40535491² = 3286252061222162, which contains 22 as substring.

Together with 40535489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40535431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20267745 + 20267746.

It is an arithmetic number, because the mean of its divisors is an integer number (20267746).

Almost surely, 2^40535491 is an apocalyptic number.

40535491 is a deficient number, since it is larger than the sum of its proper divisors (1).

40535491 is an equidigital number, since it uses as much as digits as its factorization.

40535491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 40535491 is about 6366.7488563630. The cubic root of 40535491 is about 343.5145571895.

Adding to 40535491 its reverse (19453504), we get a palindrome (59988995).

The spelling of 40535491 in words is "forty million, five hundred thirty-five thousand, four hundred ninety-one".