40658531 has 2 divisors, whose sum is σ = 40658532. Its totient is φ = 40658530.

The previous prime is 40658491. The next prime is 40658533. The reversal of 40658531 is 13585604.

It is a happy number.

40658531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40658531 - 2¹⁸ = 40396387 is a prime.

It is a super-5 number, since 5×40658531⁵ (a number of 39 digits) contains 55555 as substring. Note that it is a super-d number also for d = 2.

Together with 40658533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40658533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20329265 + 20329266.

It is an arithmetic number, because the mean of its divisors is an integer number (20329266).

Almost surely, 2^40658531 is an apocalyptic number.

40658531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40658531 is an equidigital number, since it uses as much as digits as its factorization.

40658531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 40658531 is about 6376.4042374994. The cubic root of 40658531 is about 343.8617701114.

The spelling of 40658531 in words is "forty million, six hundred fifty-eight thousand, five hundred thirty-one".