1191265 has 8 divisors (see below), whose sum is σ = 1446120. Its totient is φ = 941952.

The previous prime is 1191247. The next prime is 1191277. The reversal of 1191265 is 5621911.

It can be written as a sum of positive squares in 4 ways, for example, as 33489 + 1157776 = 183^2 + 1076^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1191265 - 2⁹ = 1190753 is a prime.

It is a super-2 number, since 2×1191265² = 2838224600450, which contains 22 as substring.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 1783.

It is an arithmetic number, because the mean of its divisors is an integer number (180765).

2^1191265 is an apocalyptic number.

It is an amenable number.

1191265 is a deficient number, since it is larger than the sum of its proper divisors (254855).

1191265 is an equidigital number, since it uses as much as digits as its factorization.

1191265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2771.

The product of its digits is 540, while the sum is 25.

The square root of 1191265 is about 1091.4508692561. The cubic root of 1191265 is about 106.0073864557.

It can be divided in two parts, 1191 and 265, that multiplied together give a triangular number (315615 = T₇₉₄).

The spelling of 1191265 in words is "one million, one hundred ninety-one thousand, two hundred sixty-five".