2005531397 has 2 divisors, whose sum is σ = 2005531398. Its totient is φ = 2005531396.

The previous prime is 2005531369. The next prime is 2005531403. The reversal of 2005531397 is 7931355002.

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., 1970116996 + 35414401 = 44386^2 + 5951^2 .

It is a cyclic number.

It is not a de Polignac number, because 2005531397 - 2¹² = 2005527301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2005531097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1002765698 + 1002765699.

It is an arithmetic number, because the mean of its divisors is an integer number (1002765699).

Almost surely, 2^2005531397 is an apocalyptic number.

It is an amenable number.

2005531397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2005531397 is an equidigital number, since it uses as much as digits as its factorization.

2005531397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28350, while the sum is 35.

The square root of 2005531397 is about 44783.1597478338. The cubic root of 2005531397 is about 1261.0815013178.

Adding to 2005531397 its reverse (7931355002), we get a palindrome (9936886399).

The spelling of 2005531397 in words is "two billion, five million, five hundred thirty-one thousand, three hundred ninety-seven".