2191487 has 6 divisors (see below), whose sum is σ = 2328288. Its totient is φ = 2062304.

The previous prime is 2191477. The next prime is 2191489. The reversal of 2191487 is 7841912.

It is not a de Polignac number, because 2191487 - 2⁴ = 2191471 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 (2191489) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3503 + ... + 4080.

It is an arithmetic number, because the mean of its divisors is an integer number (388048).

2^2191487 is an apocalyptic number.

2191487 is a deficient number, since it is larger than the sum of its proper divisors (136801).

2191487 is an equidigital number, since it uses as much as digits as its factorization.

2191487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7617 (or 7600 counting only the distinct ones).

The product of its digits is 4032, while the sum is 32.

The square root of 2191487 is about 1480.3671841810. The cubic root of 2191487 is about 129.8911712475.

The spelling of 2191487 in words is "two million, one hundred ninety-one thousand, four hundred eighty-seven".