1217257 has 4 divisors (see below), whose sum is σ = 1221460. Its totient is φ = 1213056.

The previous prime is 1217233. The next prime is 1217261. The reversal of 1217257 is 7527121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7527121 = 7 ⋅1075303.

It can be written as a sum of positive squares in 2 ways, for example, as 331776 + 885481 = 576^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217257 - 2¹¹ = 1215209 is a prime.

It is a Duffinian number.

1217257 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1217207) 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, 1632 + ... + 2257.

It is an arithmetic number, because the mean of its divisors is an integer number (305365).

2^1217257 is an apocalyptic number.

It is an amenable number.

1217257 is a deficient number, since it is larger than the sum of its proper divisors (4203).

1217257 is an equidigital number, since it uses as much as digits as its factorization.

1217257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4202.

The product of its digits is 980, while the sum is 25.

The square root of 1217257 is about 1103.2937052299. The cubic root of 1217257 is about 106.7728315824.

The spelling of 1217257 in words is "one million, two hundred seventeen thousand, two hundred fifty-seven".