54543991 has 2 divisors, whose sum is σ = 54543992. Its totient is φ = 54543990.

The previous prime is 54543977. The next prime is 54544019. The reversal of 54543991 is 19934545.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 54543991 - 2¹¹ = 54541943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54543901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27271995 + 27271996.

It is an arithmetic number, because the mean of its divisors is an integer number (27271996).

Almost surely, 2^54543991 is an apocalyptic number.

54543991 is a deficient number, since it is larger than the sum of its proper divisors (1).

54543991 is an equidigital number, since it uses as much as digits as its factorization.

54543991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 54543991 is about 7385.3903755997. The cubic root of 54543991 is about 379.2413094176.

The spelling of 54543991 in words is "fifty-four million, five hundred forty-three thousand, nine hundred ninety-one".