1000691489 has 4 divisors (see below), whose sum is σ = 1143647424. Its totient is φ = 857735556.

The previous prime is 1000691477. The next prime is 1000691533. The reversal of 1000691489 is 9841960001.

It is a happy number.

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 1000691489 - 2¹² = 1000687393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000691459) 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, 71477957 + ... + 71477970.

It is an arithmetic number, because the mean of its divisors is an integer number (285911856).

Almost surely, 2^1000691489 is an apocalyptic number.

It is an amenable number.

1000691489 is a deficient number, since it is larger than the sum of its proper divisors (142955935).

1000691489 is an equidigital number, since it uses as much as digits as its factorization.

1000691489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142955934.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1000691489 is about 31633.7081133401. The cubic root of 1000691489 is about 1000.2304432252.

The spelling of 1000691489 in words is "one billion, six hundred ninety-one thousand, four hundred eighty-nine".