40856521 has 2 divisors, whose sum is σ = 40856522. Its totient is φ = 40856520.

The previous prime is 40856513. The next prime is 40856531. The reversal of 40856521 is 12565804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26378496 + 14478025 = 5136^2 + 3805^2 .

It is a cyclic number.

It is not a de Polignac number, because 40856521 - 2³ = 40856513 is a prime.

It is not a weakly prime, because it can be changed into another prime (40856531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20428260 + 20428261.

It is an arithmetic number, because the mean of its divisors is an integer number (20428261).

Almost surely, 2^40856521 is an apocalyptic number.

It is an amenable number.

40856521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40856521 is an equidigital number, since it uses as much as digits as its factorization.

40856521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 40856521 is about 6391.9105907389. The cubic root of 40856521 is about 344.4190207812.

The spelling of 40856521 in words is "forty million, eight hundred fifty-six thousand, five hundred twenty-one".