54187213 has 2 divisors, whose sum is σ = 54187214. Its totient is φ = 54187212.

The previous prime is 54187187. The next prime is 54187247. The reversal of 54187213 is 31278145.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29615364 + 24571849 = 5442^2 + 4957^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54187213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54187513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27093606 + 27093607.

It is an arithmetic number, because the mean of its divisors is an integer number (27093607).

Almost surely, 2^54187213 is an apocalyptic number.

It is an amenable number.

54187213 is a deficient number, since it is larger than the sum of its proper divisors (1).

54187213 is an equidigital number, since it uses as much as digits as its factorization.

54187213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 31.

The square root of 54187213 is about 7361.1964380799. The cubic root of 54187213 is about 378.4126141154.

The spelling of 54187213 in words is "fifty-four million, one hundred eighty-seven thousand, two hundred thirteen".