2179651 has 2 divisors, whose sum is σ = 2179652. Its totient is φ = 2179650.

The previous prime is 2179649. The next prime is 2179679. The reversal of 2179651 is 1569712.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2179651 - 2¹ = 2179649 is a prime.

Together with 2179649, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2173651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1089825 + 1089826.

It is an arithmetic number, because the mean of its divisors is an integer number (1089826).

2^2179651 is an apocalyptic number.

2179651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2179651 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 11 representation: 2179651 = (1259671)₁₁.

2179651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 31.

The square root of 2179651 is about 1476.3641149798. The cubic root of 2179651 is about 129.6569059588.

The spelling of 2179651 in words is "two million, one hundred seventy-nine thousand, six hundred fifty-one".