54570821 has 2 divisors, whose sum is σ = 54570822. Its totient is φ = 54570820.

The previous prime is 54570809. The next prime is 54570823. The reversal of 54570821 is 12807545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29430625 + 25140196 = 5425^2 + 5014^2 .

It is a cyclic number.

It is not a de Polignac number, because 54570821 - 2²² = 50376517 is a prime.

It is a super-2 number, since 2×54570821² = 5955949009228082, which contains 22 as substring.

Together with 54570823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54570823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27285410 + 27285411.

It is an arithmetic number, because the mean of its divisors is an integer number (27285411).

Almost surely, 2^54570821 is an apocalyptic number.

It is an amenable number.

54570821 is a deficient number, since it is larger than the sum of its proper divisors (1).

54570821 is an equidigital number, since it uses as much as digits as its factorization.

54570821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 54570821 is about 7387.2065762371. The cubic root of 54570821 is about 379.3034817196.

The spelling of 54570821 in words is "fifty-four million, five hundred seventy thousand, eight hundred twenty-one".