2191497 has 32 divisors (see below), whose sum is σ = 3732480. Its totient is φ = 1110720.

The previous prime is 2191493. The next prime is 2191507. The reversal of 2191497 is 7941912.

It is not a de Polignac number, because 2191497 - 2² = 2191493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12154 + ... + 12332.

It is an arithmetic number, because the mean of its divisors is an integer number (116640).

2^2191497 is an apocalyptic number.

It is an amenable number.

2191497 is a deficient number, since it is larger than the sum of its proper divisors (1540983).

2191497 is a wasteful number, since it uses less digits than its factorization.

2191497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253.

The product of its digits is 4536, while the sum is 33.

The square root of 2191497 is about 1480.3705617176. The cubic root of 2191497 is about 129.8913688165.

The spelling of 2191497 in words is "two million, one hundred ninety-one thousand, four hundred ninety-seven".