689851971 has 64 divisors (see below), whose sum is σ = 1092240000. Its totient is φ = 435020544.

The previous prime is 689851961. The next prime is 689851973. The reversal of 689851971 is 179158986.

It is not a de Polignac number, because 689851971 - 2⁶ = 689851907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689851973) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4629805 + ... + 4629953.

It is an arithmetic number, because the mean of its divisors is an integer number (17066250).

Almost surely, 2^689851971 is an apocalyptic number.

689851971 is a deficient number, since it is larger than the sum of its proper divisors (402388029).

689851971 is an equidigital number, since it uses as much as digits as its factorization.

689851971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 254 counting only the distinct ones).

The product of its digits is 1088640, while the sum is 54.

The square root of 689851971 is about 26265.0332381286. The cubic root of 689851971 is about 883.5923961008.

The spelling of 689851971 in words is "six hundred eighty-nine million, eight hundred fifty-one thousand, nine hundred seventy-one".