1151989 has 4 divisors (see below), whose sum is σ = 1212640. Its totient is φ = 1091340.

The previous prime is 1151987. The next prime is 1151993. The reversal of 1151989 is 9891511.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1151989 - 2¹ = 1151987 is a prime.

It is a super-2 number, since 2×1151989² = 2654157312242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1151981) 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, 30297 + ... + 30334.

It is an arithmetic number, because the mean of its divisors is an integer number (303160).

2^1151989 is an apocalyptic number.

1151989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1151989 is a deficient number, since it is larger than the sum of its proper divisors (60651).

1151989 is an equidigital number, since it uses as much as digits as its factorization.

1151989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60650.

The product of its digits is 3240, while the sum is 34.

The square root of 1151989 is about 1073.3075048652. The cubic root of 1151989 is about 104.8293221081.

The spelling of 1151989 in words is "one million, one hundred fifty-one thousand, nine hundred eighty-nine".