54821989 has 2 divisors, whose sum is σ = 54821990. Its totient is φ = 54821988.

The previous prime is 54821983. The next prime is 54821993. The reversal of 54821989 is 98912845.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48191364 + 6630625 = 6942^2 + 2575^2 .

It is a cyclic number.

It is not a de Polignac number, because 54821989 - 2¹⁵ = 54789221 is a prime.

It is a super-2 number, since 2×54821989² = 6010900955832242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54821983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27410994 + 27410995.

It is an arithmetic number, because the mean of its divisors is an integer number (27410995).

Almost surely, 2^54821989 is an apocalyptic number.

It is an amenable number.

54821989 is a deficient number, since it is larger than the sum of its proper divisors (1).

54821989 is an equidigital number, since it uses as much as digits as its factorization.

54821989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 54821989 is about 7404.1872612732. The cubic root of 54821989 is about 379.8845193877.

The spelling of 54821989 in words is "fifty-four million, eight hundred twenty-one thousand, nine hundred eighty-nine".