40158691 has 2 divisors, whose sum is σ = 40158692. Its totient is φ = 40158690.

The previous prime is 40158659. The next prime is 40158697. The reversal of 40158691 is 19685104.

40158691 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 40158691 - 2⁵ = 40158659 is a prime.

It is a super-2 number, since 2×40158691² = 3225440925666962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40158697) 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, 20079345 + 20079346.

It is an arithmetic number, because the mean of its divisors is an integer number (20079346).

Almost surely, 2^40158691 is an apocalyptic number.

40158691 is a deficient number, since it is larger than the sum of its proper divisors (1).

40158691 is an equidigital number, since it uses as much as digits as its factorization.

40158691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 40158691 is about 6337.0885270761. The cubic root of 40158691 is about 342.4468555544.

The spelling of 40158691 in words is "forty million, one hundred fifty-eight thousand, six hundred ninety-one".