40817431 has 2 divisors, whose sum is σ = 40817432. Its totient is φ = 40817430.

The previous prime is 40817423. The next prime is 40817461. The reversal of 40817431 is 13471804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40817431 - 2³ = 40817423 is a prime.

It is a super-2 number, since 2×40817431² = 3332125346879522, which contains 22 as substring.

It is equal to p_2480392 and since 40817431 and 2480392 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40817431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40817461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20408715 + 20408716.

It is an arithmetic number, because the mean of its divisors is an integer number (20408716).

Almost surely, 2^40817431 is an apocalyptic number.

40817431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40817431 is an equidigital number, since it uses as much as digits as its factorization.

40817431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 40817431 is about 6388.8520878167. The cubic root of 40817431 is about 344.3091432944.

The spelling of 40817431 in words is "forty million, eight hundred seventeen thousand, four hundred thirty-one".