689968969 has 4 divisors (see below), whose sum is σ = 691084240. Its totient is φ = 688853700.

The previous prime is 689968967. The next prime is 689968991. The reversal of 689968969 is 969869986.

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, and also an emirpimes, since its reverse is a distinct semiprime: 969869986 = 2 ⋅484934993.

It is a cyclic number.

It is not a de Polignac number, because 689968969 - 2¹ = 689968967 is a prime.

It is a super-2 number, since 2×689968969² = 952114356365845922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689968898 and 689968907.

It is not an unprimeable number, because it can be changed into a prime (689968963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 556707 + ... + 557944.

It is an arithmetic number, because the mean of its divisors is an integer number (172771060).

Almost surely, 2^689968969 is an apocalyptic number.

It is an amenable number.

689968969 is a deficient number, since it is larger than the sum of its proper divisors (1115271).

689968969 is a wasteful number, since it uses less digits than its factorization.

689968969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115270.

The product of its digits is 90699264, while the sum is 70.

The square root of 689968969 is about 26267.2604014960. The cubic root of 689968969 is about 883.6423453187.

The spelling of 689968969 in words is "six hundred eighty-nine million, nine hundred sixty-eight thousand, nine hundred sixty-nine".