2173771409 has 2 divisors, whose sum is σ = 2173771410. Its totient is φ = 2173771408.

The previous prime is 2173771273. The next prime is 2173771433. The reversal of 2173771409 is 9041773712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1591611025 + 582160384 = 39895^2 + 24128^2 .

It is a cyclic number.

It is not a de Polignac number, because 2173771409 - 2²⁸ = 1905335953 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2173771459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086885704 + 1086885705.

It is an arithmetic number, because the mean of its divisors is an integer number (1086885705).

Almost surely, 2^2173771409 is an apocalyptic number.

It is an amenable number.

2173771409 is a deficient number, since it is larger than the sum of its proper divisors (1).

2173771409 is an equidigital number, since it uses as much as digits as its factorization.

2173771409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 41.

The square root of 2173771409 is about 46623.7215267078. The cubic root of 2173771409 is about 1295.4021815489.

The spelling of 2173771409 in words is "two billion, one hundred seventy-three million, seven hundred seventy-one thousand, four hundred nine".