2151197 has 4 divisors (see below), whose sum is σ = 2277756. Its totient is φ = 2024640.

The previous prime is 2151179. The next prime is 2151203. The reversal of 2151197 is 7911512.

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 1907161 + 244036 = 1381^2 + 494^2 .

It is a cyclic number.

It is not a de Polignac number, because 2151197 - 2¹⁴ = 2134813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151137) 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, 63254 + ... + 63287.

It is an arithmetic number, because the mean of its divisors is an integer number (569439).

2^2151197 is an apocalyptic number.

It is an amenable number.

2151197 is a deficient number, since it is larger than the sum of its proper divisors (126559).

2151197 is a wasteful number, since it uses less digits than its factorization.

2151197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126558.

The product of its digits is 630, while the sum is 26.

The square root of 2151197 is about 1466.6959466774. The cubic root of 2151197 is about 129.0902359255.

The spelling of 2151197 in words is "two million, one hundred fifty-one thousand, one hundred ninety-seven".