2117651 has 2 divisors, whose sum is σ = 2117652. Its totient is φ = 2117650.

The previous prime is 2117623. The next prime is 2117653. The reversal of 2117651 is 1567112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2117651 - 2¹⁰ = 2116627 is a prime.

Together with 2117653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2117653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058825 + 1058826.

It is an arithmetic number, because the mean of its divisors is an integer number (1058826).

2^2117651 is an apocalyptic number.

2117651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2117651 is an equidigital number, since it uses as much as digits as its factorization.

2117651 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 2117651 is about 1455.2151043746. The cubic root of 2117651 is about 128.4157016994.

The spelling of 2117651 in words is "two million, one hundred seventeen thousand, six hundred fifty-one".