2172761 has 2 divisors, whose sum is σ = 2172762. Its totient is φ = 2172760.

The previous prime is 2172733. The next prime is 2172773. The reversal of 2172761 is 1672712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 534361 = 1280^2 + 731^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172761 - 2¹⁰ = 2171737 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2172761.

It is not a weakly prime, because it can be changed into another prime (2172701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086380 + 1086381.

It is an arithmetic number, because the mean of its divisors is an integer number (1086381).

2^2172761 is an apocalyptic number.

It is an amenable number.

2172761 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172761 is an equidigital number, since it uses as much as digits as its factorization.

2172761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1176, while the sum is 26.

The square root of 2172761 is about 1474.0288328252. The cubic root of 2172761 is about 129.5201441510.

The spelling of 2172761 in words is "two million, one hundred seventy-two thousand, seven hundred sixty-one".