1391197 has 4 divisors (see below), whose sum is σ = 1417500. Its totient is φ = 1364896.

The previous prime is 1391189. The next prime is 1391207. The reversal of 1391197 is 7911931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7911931 = 23 ⋅343997.

It can be written as a sum of positive squares in 2 ways, for example, as 1038361 + 352836 = 1019^2 + 594^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391197 - 2³ = 1391189 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1391197 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391597) 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, 13072 + ... + 13177.

It is an arithmetic number, because the mean of its divisors is an integer number (354375).

2^1391197 is an apocalyptic number.

It is an amenable number.

1391197 is a deficient number, since it is larger than the sum of its proper divisors (26303).

1391197 is an equidigital number, since it uses as much as digits as its factorization.

1391197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26302.

The product of its digits is 1701, while the sum is 31.

The square root of 1391197 is about 1179.4901440877. The cubic root of 1391197 is about 111.6339291671.

The spelling of 1391197 in words is "one million, three hundred ninety-one thousand, one hundred ninety-seven".