5547121397 has 2 divisors, whose sum is σ = 5547121398. Its totient is φ = 5547121396.

The previous prime is 5547121381. The next prime is 5547121409. The reversal of 5547121397 is 7931217455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5477332081 + 69789316 = 74009^2 + 8354^2 .

It is a cyclic number.

It is not a de Polignac number, because 5547121397 - 2⁴ = 5547121381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5547121337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2773560698 + 2773560699.

It is an arithmetic number, because the mean of its divisors is an integer number (2773560699).

Almost surely, 2^5547121397 is an apocalyptic number.

It is an amenable number.

5547121397 is a deficient number, since it is larger than the sum of its proper divisors (1).

5547121397 is an equidigital number, since it uses as much as digits as its factorization.

5547121397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 264600, while the sum is 44.

The square root of 5547121397 is about 74478.9997046147. Note that the first 3 decimals coincide. The cubic root of 5547121397 is about 1770.2008982816.

Adding to 5547121397 its sum of digits (44), we get a square (5547121441 = 74479²).

The spelling of 5547121397 in words is "five billion, five hundred forty-seven million, one hundred twenty-one thousand, three hundred ninety-seven".