2156993 has 2 divisors, whose sum is σ = 2156994. Its totient is φ = 2156992.

The previous prime is 2156939. The next prime is 2157007. The reversal of 2156993 is 3996512.

Together with previous prime (2156939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1817104 + 339889 = 1348^2 + 583^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156993 - 2¹⁴ = 2140609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2156393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078496 + 1078497.

It is an arithmetic number, because the mean of its divisors is an integer number (1078497).

2^2156993 is an apocalyptic number.

It is an amenable number.

2156993 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156993 is an equidigital number, since it uses as much as digits as its factorization.

2156993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580, while the sum is 35.

The square root of 2156993 is about 1468.6704872094. The cubic root of 2156993 is about 129.2060684974.

The spelling of 2156993 in words is "two million, one hundred fifty-six thousand, nine hundred ninety-three".