1151997 has 16 divisors (see below), whose sum is σ = 1915392. Its totient is φ = 598320.

The previous prime is 1151993. The next prime is 1151999. The reversal of 1151997 is 7991511.

It is a happy number.

It is not a de Polignac number, because 1151997 - 2² = 1151993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2263 + ... + 2724.

It is an arithmetic number, because the mean of its divisors is an integer number (119712).

2^1151997 is an apocalyptic number.

It is an amenable number.

1151997 is a deficient number, since it is larger than the sum of its proper divisors (763395).

1151997 is a wasteful number, since it uses less digits than its factorization.

1151997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008.

The product of its digits is 2835, while the sum is 33.

The square root of 1151997 is about 1073.3112316565. The cubic root of 1151997 is about 104.8295647703.

It can be divided in two parts, 115 and 1997, that added together give a palindrome (2112).

The spelling of 1151997 in words is "one million, one hundred fifty-one thousand, nine hundred ninety-seven".