40554821 has 2 divisors, whose sum is σ = 40554822. Its totient is φ = 40554820.

The previous prime is 40554817. The next prime is 40554859. The reversal of 40554821 is 12845504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29757025 + 10797796 = 5455^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 40554821 - 2² = 40554817 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40554121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20277410 + 20277411.

It is an arithmetic number, because the mean of its divisors is an integer number (20277411).

Almost surely, 2^40554821 is an apocalyptic number.

It is an amenable number.

40554821 is a deficient number, since it is larger than the sum of its proper divisors (1).

40554821 is an equidigital number, since it uses as much as digits as its factorization.

40554821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 40554821 is about 6368.2667186606. The cubic root of 40554821 is about 343.5691519904.

The spelling of 40554821 in words is "forty million, five hundred fifty-four thousand, eight hundred twenty-one".