2155397 has 2 divisors, whose sum is σ = 2155398. Its totient is φ = 2155396.

The previous prime is 2155393. The next prime is 2155409. The reversal of 2155397 is 7935512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2149156 + 6241 = 1466^2 + 79^2 .

It is a cyclic number.

It is not a de Polignac number, because 2155397 - 2² = 2155393 is a prime.

It is a super-3 number, since 3×2155397³ = 30040217783339267319, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2155393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077698 + 1077699.

It is an arithmetic number, because the mean of its divisors is an integer number (1077699).

2^2155397 is an apocalyptic number.

It is an amenable number.

2155397 is a deficient number, since it is larger than the sum of its proper divisors (1).

2155397 is an equidigital number, since it uses as much as digits as its factorization.

2155397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 32.

The square root of 2155397 is about 1468.1270380999. The cubic root of 2155397 is about 129.1741932948.

It can be divided in two parts, 2155 and 397, that added together give a palindrome (2552).

The spelling of 2155397 in words is "two million, one hundred fifty-five thousand, three hundred ninety-seven".