54155021 has 2 divisors, whose sum is σ = 54155022. Its totient is φ = 54155020.

The previous prime is 54155011. The next prime is 54155027. The reversal of 54155021 is 12055145.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31696900 + 22458121 = 5630^2 + 4739^2 .

It is a cyclic number.

It is not a de Polignac number, because 54155021 - 2¹⁰ = 54153997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54155027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27077510 + 27077511.

It is an arithmetic number, because the mean of its divisors is an integer number (27077511).

Almost surely, 2^54155021 is an apocalyptic number.

It is an amenable number.

54155021 is a deficient number, since it is larger than the sum of its proper divisors (1).

54155021 is an equidigital number, since it uses as much as digits as its factorization.

54155021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 54155021 is about 7359.0095121558. The cubic root of 54155021 is about 378.3376624102.

The spelling of 54155021 in words is "fifty-four million, one hundred fifty-five thousand, twenty-one".