2145361 has 2 divisors, whose sum is σ = 2145362. Its totient is φ = 2145360.

The previous prime is 2145359. The next prime is 2145379. The reversal of 2145361 is 1635412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1115136 + 1030225 = 1056^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145361 - 2¹ = 2145359 is a prime.

Together with 2145359, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072680 + 1072681.

It is an arithmetic number, because the mean of its divisors is an integer number (1072681).

2^2145361 is an apocalyptic number.

It is an amenable number.

2145361 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145361 is an equidigital number, since it uses as much as digits as its factorization.

2145361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 720, while the sum is 22.

The square root of 2145361 is about 1464.7050897706. The cubic root of 2145361 is about 128.9733935473.

The spelling of 2145361 in words is "two million, one hundred forty-five thousand, three hundred sixty-one".