40821553 has 2 divisors, whose sum is σ = 40821554. Its totient is φ = 40821552.

The previous prime is 40821533. The next prime is 40821563. The reversal of 40821553 is 35512804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20903184 + 19918369 = 4572^2 + 4463^2 .

It is a cyclic number.

It is not a de Polignac number, because 40821553 - 2¹³ = 40813361 is a prime.

It is equal to p_2480617 and since 40821553 and 2480617 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (40821523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20410776 + 20410777.

It is an arithmetic number, because the mean of its divisors is an integer number (20410777).

Almost surely, 2^40821553 is an apocalyptic number.

It is an amenable number.

40821553 is a deficient number, since it is larger than the sum of its proper divisors (1).

40821553 is an equidigital number, since it uses as much as digits as its factorization.

40821553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 40821553 is about 6389.1746728353. The cubic root of 40821553 is about 344.3207330693.

The spelling of 40821553 in words is "forty million, eight hundred twenty-one thousand, five hundred fifty-three".