547378861 has 2 divisors, whose sum is σ = 547378862. Its totient is φ = 547378860.

The previous prime is 547378789. The next prime is 547378879. The reversal of 547378861 is 168873745.

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., 428241636 + 119137225 = 20694^2 + 10915^2 .

It is a cyclic number.

It is not a de Polignac number, because 547378861 - 2¹³ = 547370669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (547378891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 273689430 + 273689431.

It is an arithmetic number, because the mean of its divisors is an integer number (273689431).

Almost surely, 2^547378861 is an apocalyptic number.

It is an amenable number.

547378861 is a deficient number, since it is larger than the sum of its proper divisors (1).

547378861 is an equidigital number, since it uses as much as digits as its factorization.

547378861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 49.

The square root of 547378861 is about 23396.1291883935. The cubic root of 547378861 is about 818.0176490634.

The spelling of 547378861 in words is "five hundred forty-seven million, three hundred seventy-eight thousand, eight hundred sixty-one".