689971097 has 4 divisors (see below), whose sum is σ = 696802596. Its totient is φ = 683139600.

The previous prime is 689971081. The next prime is 689971099. The reversal of 689971097 is 790179986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 618467161 + 71503936 = 24869^2 + 8456^2 .

It is a cyclic number.

It is not a de Polignac number, because 689971097 - 2⁴ = 689971081 is a prime.

It is a super-2 number, since 2×689971097² = 952120229390766818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689971099) 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 3 ways as a sum of consecutive naturals, for example, 3415598 + ... + 3415799.

It is an arithmetic number, because the mean of its divisors is an integer number (174200649).

Almost surely, 2^689971097 is an apocalyptic number.

It is an amenable number.

689971097 is a deficient number, since it is larger than the sum of its proper divisors (6831499).

689971097 is a wasteful number, since it uses less digits than its factorization.

689971097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6831498.

The product of its (nonzero) digits is 1714608, while the sum is 56.

The square root of 689971097 is about 26267.3009081634. The cubic root of 689971097 is about 883.6432537601.

The spelling of 689971097 in words is "six hundred eighty-nine million, nine hundred seventy-one thousand, ninety-seven".