40089521 has 2 divisors, whose sum is σ = 40089522. Its totient is φ = 40089520.

The previous prime is 40089499. The next prime is 40089523. The reversal of 40089521 is 12598004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37957921 + 2131600 = 6161^2 + 1460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40089521 is a prime.

Together with 40089523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40089523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20044760 + 20044761.

It is an arithmetic number, because the mean of its divisors is an integer number (20044761).

Almost surely, 2^40089521 is an apocalyptic number.

It is an amenable number.

40089521 is a deficient number, since it is larger than the sum of its proper divisors (1).

40089521 is an equidigital number, since it uses as much as digits as its factorization.

40089521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 40089521 is about 6331.6286214528. The cubic root of 40089521 is about 342.2501305028.

The spelling of 40089521 in words is "forty million, eighty-nine thousand, five hundred twenty-one".