1191257 has 4 divisors (see below), whose sum is σ = 1203636. Its totient is φ = 1178880.

The previous prime is 1191247. The next prime is 1191277. The reversal of 1191257 is 7521911.

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 811801 + 379456 = 901^2 + 616^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191257 - 2¹⁸ = 929113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191247) 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, 6044 + ... + 6237.

It is an arithmetic number, because the mean of its divisors is an integer number (300909).

2^1191257 is an apocalyptic number.

It is an amenable number.

1191257 is a deficient number, since it is larger than the sum of its proper divisors (12379).

1191257 is an equidigital number, since it uses as much as digits as its factorization.

1191257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12378.

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

The square root of 1191257 is about 1091.4472044034. The cubic root of 1191257 is about 106.0071491559.

The spelling of 1191257 in words is "one million, one hundred ninety-one thousand, two hundred fifty-seven".