40915213 has 2 divisors, whose sum is σ = 40915214. Its totient is φ = 40915212.

The previous prime is 40915211. The next prime is 40915219. The reversal of 40915213 is 31251904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32695524 + 8219689 = 5718^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 40915213 - 2¹ = 40915211 is a prime.

Together with 40915211, it forms a pair of twin primes.

It is the 6397-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40915211) by changing a digit.

It is a nontrivial repunit in base 6396.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20457606 + 20457607.

It is an arithmetic number, because the mean of its divisors is an integer number (20457607).

Almost surely, 2^40915213 is an apocalyptic number.

It is an amenable number.

40915213 is a deficient number, since it is larger than the sum of its proper divisors (1).

40915213 is an equidigital number, since it uses as much as digits as its factorization.

40915213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 40915213 is about 6396.5000586258. The cubic root of 40915213 is about 344.5838656961.

The spelling of 40915213 in words is "forty million, nine hundred fifteen thousand, two hundred thirteen".