1161257 has 4 divisors (see below), whose sum is σ = 1180356. Its totient is φ = 1142160.

The previous prime is 1161241. The next prime is 1161263. The reversal of 1161257 is 7521611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7521611 = 569 ⋅13219.

It can be written as a sum of positive squares in 2 ways, for example, as 18496 + 1142761 = 136^2 + 1069^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161257 - 2⁴ = 1161241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161217) 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, 9458 + ... + 9579.

It is an arithmetic number, because the mean of its divisors is an integer number (295089).

2^1161257 is an apocalyptic number.

It is an amenable number.

1161257 is a deficient number, since it is larger than the sum of its proper divisors (19099).

1161257 is an equidigital number, since it uses as much as digits as its factorization.

1161257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19098.

The product of its digits is 420, while the sum is 23.

The square root of 1161257 is about 1077.6163510267. The cubic root of 1161257 is about 105.1096963928.

Adding to 1161257 its reverse (7521611), we get a palindrome (8682868).

The spelling of 1161257 in words is "one million, one hundred sixty-one thousand, two hundred fifty-seven".