2156647 has 2 divisors, whose sum is σ = 2156648. Its totient is φ = 2156646.

The previous prime is 2156629. The next prime is 2156659. The reversal of 2156647 is 7466512.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2156647 - 2¹⁵ = 2123879 is a prime.

It is a super-2 number, since 2×2156647² = 9302252565218, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2156617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078323 + 1078324.

It is an arithmetic number, because the mean of its divisors is an integer number (1078324).

2^2156647 is an apocalyptic number.

2156647 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156647 is an equidigital number, since it uses as much as digits as its factorization.

2156647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10080, while the sum is 31.

The square root of 2156647 is about 1468.5526888743. The cubic root of 2156647 is about 129.1991595443.

The spelling of 2156647 in words is "two million, one hundred fifty-six thousand, six hundred forty-seven".