2147491 has 4 divisors (see below), whose sum is σ = 2273832. Its totient is φ = 2021152.

The previous prime is 2147489. The next prime is 2147501. The reversal of 2147491 is 1947412.

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

It is a cyclic number.

It is not a de Polignac number, because 2147491 - 2¹ = 2147489 is a prime.

It is a super-2 number, since 2×2147491² = 9223435190162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2147461) 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, 63145 + ... + 63178.

It is an arithmetic number, because the mean of its divisors is an integer number (568458).

2^2147491 is an apocalyptic number.

2147491 is a deficient number, since it is larger than the sum of its proper divisors (126341).

2147491 is a wasteful number, since it uses less digits than its factorization.

2147491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126340.

The product of its digits is 2016, while the sum is 28.

The square root of 2147491 is about 1465.4320182117. The cubic root of 2147491 is about 129.0160627395.

The spelling of 2147491 in words is "two million, one hundred forty-seven thousand, four hundred ninety-one".