2171537393 has 2 divisors, whose sum is σ = 2171537394. Its totient is φ = 2171537392.

The previous prime is 2171537339. The next prime is 2171537443. The reversal of 2171537393 is 3937351712.

2171537393 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

Together with previous prime (2171537339) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1725820849 + 445716544 = 41543^2 + 21112^2 .

It is a cyclic number.

It is not a de Polignac number, because 2171537393 - 2¹⁶ = 2171471857 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2171537393.

It is not a weakly prime, because it can be changed into another prime (2171537323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085768696 + 1085768697.

It is an arithmetic number, because the mean of its divisors is an integer number (1085768697).

Almost surely, 2^2171537393 is an apocalyptic number.

It is an amenable number.

2171537393 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171537393 is an equidigital number, since it uses as much as digits as its factorization.

2171537393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119070, while the sum is 41.

The square root of 2171537393 is about 46599.7574349910. The cubic root of 2171537393 is about 1294.9582616503.

The spelling of 2171537393 in words is "two billion, one hundred seventy-one million, five hundred thirty-seven thousand, three hundred ninety-three".