1231089 has 16 divisors (see below), whose sum is σ = 1762560. Its totient is φ = 761600.

The previous prime is 1231073. The next prime is 1231091. The reversal of 1231089 is 9801321.

It is not a de Polignac number, because 1231089 - 2⁴ = 1231073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1231039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5032 + ... + 5270.

It is an arithmetic number, because the mean of its divisors is an integer number (110160).

2^1231089 is an apocalyptic number.

It is an amenable number.

1231089 is a deficient number, since it is larger than the sum of its proper divisors (531471).

1231089 is a wasteful number, since it uses less digits than its factorization.

1231089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1231089 is about 1109.5445011355. The cubic root of 1231089 is about 107.1757382255.

The spelling of 1231089 in words is "one million, two hundred thirty-one thousand, eighty-nine".