40531145 has 16 divisors (see below), whose sum is σ = 52349328. Its totient is φ = 30013440.

The previous prime is 40531121. The next prime is 40531157. The reversal of 40531145 is 54113504.

40531145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 12694969 + 27836176 = 3563^2 + 5276^2 .

It is not a de Polignac number, because 40531145 - 2¹² = 40527049 is a prime.

It is a super-2 number, since 2×40531145² = 3285547430022050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 40531145.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 1277 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (3271833).

Almost surely, 2^40531145 is an apocalyptic number.

It is an amenable number.

40531145 is a deficient number, since it is larger than the sum of its proper divisors (11818183).

40531145 is a wasteful number, since it uses less digits than its factorization.

40531145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7900.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 40531145 is about 6366.4075427198. The cubic root of 40531145 is about 343.5022801487.

Adding to 40531145 its reverse (54113504), we get a palindrome (94644649).

The spelling of 40531145 in words is "forty million, five hundred thirty-one thousand, one hundred forty-five".