40310521 has 2 divisors, whose sum is σ = 40310522. Its totient is φ = 40310520.

The previous prime is 40310497. The next prime is 40310531. The reversal of 40310521 is 12501304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40195600 + 114921 = 6340^2 + 339^2 .

It is a cyclic number.

It is not a de Polignac number, because 40310521 - 2¹³ = 40302329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40310495 and 40310504.

It is not a weakly prime, because it can be changed into another prime (40310531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20155260 + 20155261.

It is an arithmetic number, because the mean of its divisors is an integer number (20155261).

Almost surely, 2^40310521 is an apocalyptic number.

It is an amenable number.

40310521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40310521 is an equidigital number, since it uses as much as digits as its factorization.

40310521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 40310521 is about 6349.0567015896. The cubic root of 40310521 is about 342.8778815415.

Adding to 40310521 its reverse (12501304), we get a palindrome (52811825).

The spelling of 40310521 in words is "forty million, three hundred ten thousand, five hundred twenty-one".