2155597 has 2 divisors, whose sum is σ = 2155598. Its totient is φ = 2155596.

The previous prime is 2155579. The next prime is 2155603. The reversal of 2155597 is 7955512.

Together with previous prime (2155579) 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., 1320201 + 835396 = 1149^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155597 - 2¹⁹ = 1631309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077798 + 1077799.

It is an arithmetic number, because the mean of its divisors is an integer number (1077799).

2^2155597 is an apocalyptic number.

It is an amenable number.

2155597 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155597 is an equidigital number, since it uses as much as digits as its factorization.

2155597 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15750, while the sum is 34.

The square root of 2155597 is about 1468.1951505164. The cubic root of 2155597 is about 129.1781885432.

The spelling of 2155597 in words is "two million, one hundred fifty-five thousand, five hundred ninety-seven".