2171551 has 2 divisors, whose sum is σ = 2171552. Its totient is φ = 2171550.

The previous prime is 2171527. The next prime is 2171557. The reversal of 2171551 is 1551712.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2171551 is a 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 (2171557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085775 + 1085776.

It is an arithmetic number, because the mean of its divisors is an integer number (1085776).

2^2171551 is an apocalyptic number.

2171551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171551 is an equidigital number, since it uses as much as digits as its factorization.

2171551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 350, while the sum is 22.

The square root of 2171551 is about 1473.6183359337. The cubic root of 2171551 is about 129.4960966410.

It can be divided in two parts, 217155 and 1, that added together give a square (217156 = 466²).

The spelling of 2171551 in words is "two million, one hundred seventy-one thousand, five hundred fifty-one".