2161751 has 2 divisors, whose sum is σ = 2161752. Its totient is φ = 2161750.

The previous prime is 2161729. The next prime is 2161759. The reversal of 2161751 is 1571612.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2161751 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2161759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1080875 + 1080876.

It is an arithmetic number, because the mean of its divisors is an integer number (1080876).

2^2161751 is an apocalyptic number.

2161751 is a deficient number, since it is larger than the sum of its proper divisors (1).

2161751 is an equidigital number, since it uses as much as digits as its factorization.

2161751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 2161751 is about 1470.2894272897. The cubic root of 2161751 is about 129.3010017374.

The spelling of 2161751 in words is "two million, one hundred sixty-one thousand, seven hundred fifty-one".