2172651757 has 2 divisors, whose sum is σ = 2172651758. Its totient is φ = 2172651756.

The previous prime is 2172651749. The next prime is 2172651779. The reversal of 2172651757 is 7571562712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2169603241 + 3048516 = 46579^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 2172651757 - 2³ = 2172651749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2172651707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1086325878 + 1086325879.

It is an arithmetic number, because the mean of its divisors is an integer number (1086325879).

Almost surely, 2^2172651757 is an apocalyptic number.

It is an amenable number.

2172651757 is a deficient number, since it is larger than the sum of its proper divisors (1).

2172651757 is an equidigital number, since it uses as much as digits as its factorization.

2172651757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205800, while the sum is 43.

The square root of 2172651757 is about 46611.7126589444. The cubic root of 2172651757 is about 1295.1797342500.

The spelling of 2172651757 in words is "two billion, one hundred seventy-two million, six hundred fifty-one thousand, seven hundred fifty-seven".