1191015 has 48 divisors (see below), whose sum is σ = 2496000. Its totient is φ = 513216.

The previous prime is 1191013. The next prime is 1191019. The reversal of 1191015 is 5101911.

It is a Cunningham number, because it is equal to 106³-1.

It is not a de Polignac number, because 1191015 - 2¹ = 1191013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5886 + ... + 6084.

It is an arithmetic number, because the mean of its divisors is an integer number (52000).

2^1191015 is an apocalyptic number.

1191015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1191015 is an abundant number, since it is smaller than the sum of its proper divisors (1304985).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1191015 is a wasteful number, since it uses less digits than its factorization.

1191015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236 (or 233 counting only the distinct ones).

The product of its (nonzero) digits is 45, while the sum is 18.

The square root of 1191015 is about 1091.3363367908. The cubic root of 1191015 is about 105.9999703334. Note that the first 4 decimals are identical.

Adding to 1191015 its reverse (5101911), we get a palindrome (6292926).

The spelling of 1191015 in words is "one million, one hundred ninety-one thousand, fifteen".