1191481 has 2 divisors, whose sum is σ = 1191482. Its totient is φ = 1191480.

The previous prime is 1191457. The next prime is 1191499. The reversal of 1191481 is 1841911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 665856 + 525625 = 816^2 + 725^2 .

It is an emirp because it is prime and its reverse (1841911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1191481 - 2⁷ = 1191353 is a prime.

It is a super-2 number, since 2×1191481² = 2839253946722, which contains 22 as substring.

It is equal to p₉₂₃₂₉ and since 1191481 and 92329 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1191431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595740 + 595741.

It is an arithmetic number, because the mean of its divisors is an integer number (595741).

2^1191481 is an apocalyptic number.

It is an amenable number.

1191481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191481 is an equidigital number, since it uses as much as digits as its factorization.

1191481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 25.

The square root of 1191481 is about 1091.5498156291. The cubic root of 1191481 is about 106.0137931499.

It can be divided in two parts, 119 and 1481, that added together give a square (1600 = 40²).

The spelling of 1191481 in words is "one million, one hundred ninety-one thousand, four hundred eighty-one".