2145697 has 4 divisors (see below), whose sum is σ = 2155140. Its totient is φ = 2136256.

The previous prime is 2145683. The next prime is 2145707. The reversal of 2145697 is 7965412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 1766241 = 616^2 + 1329^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2145697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2145617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4372 + ... + 4837.

It is an arithmetic number, because the mean of its divisors is an integer number (538785).

2^2145697 is an apocalyptic number.

It is an amenable number.

2145697 is a deficient number, since it is larger than the sum of its proper divisors (9443).

2145697 is an equidigital number, since it uses as much as digits as its factorization.

2145697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9442.

The product of its digits is 15120, while the sum is 34.

The square root of 2145697 is about 1464.8197841373. The cubic root of 2145697 is about 128.9801263377.

The spelling of 2145697 in words is "two million, one hundred forty-five thousand, six hundred ninety-seven".