689215249 has 4 divisors (see below), whose sum is σ = 689335920. Its totient is φ = 689094580.

The previous prime is 689215231. The next prime is 689215273. The reversal of 689215249 is 942512986.

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 689215249 - 2⁹ = 689214737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689215199 and 689215208.

It is not an unprimeable number, because it can be changed into a prime (689215229) 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, 51319 + ... + 63340.

It is an arithmetic number, because the mean of its divisors is an integer number (172333980).

Almost surely, 2^689215249 is an apocalyptic number.

It is an amenable number.

689215249 is a deficient number, since it is larger than the sum of its proper divisors (120671).

689215249 is a wasteful number, since it uses less digits than its factorization.

689215249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120670.

The product of its digits is 311040, while the sum is 46.

The square root of 689215249 is about 26252.9093435375. The cubic root of 689215249 is about 883.3204653479.

The spelling of 689215249 in words is "six hundred eighty-nine million, two hundred fifteen thousand, two hundred forty-nine".