40355531 has 2 divisors, whose sum is σ = 40355532. Its totient is φ = 40355530.

The previous prime is 40355519. The next prime is 40355533. The reversal of 40355531 is 13555304.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40355531 is a prime.

It is a super-2 number, since 2×40355531² = 3257137764583922, which contains 22 as substring.

Together with 40355533, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40355531.

It is not a weakly prime, because it can be changed into another prime (40355533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20177765 + 20177766.

It is an arithmetic number, because the mean of its divisors is an integer number (20177766).

Almost surely, 2^40355531 is an apocalyptic number.

40355531 is a deficient number, since it is larger than the sum of its proper divisors (1).

40355531 is an equidigital number, since it uses as much as digits as its factorization.

40355531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 40355531 is about 6352.6003337216. The cubic root of 40355531 is about 343.0054511568.

The spelling of 40355531 in words is "forty million, three hundred fifty-five thousand, five hundred thirty-one".