689972129 has 24 divisors (see below), whose sum is σ = 878693760. Its totient is φ = 530228160.

The previous prime is 689972119. The next prime is 689972161. The reversal of 689972129 is 921279986.

It is not a de Polignac number, because 689972129 - 2⁸ = 689971873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689972119) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 56252 + ... + 67410.

It is an arithmetic number, because the mean of its divisors is an integer number (36612240).

Almost surely, 2^689972129 is an apocalyptic number.

It is an amenable number.

689972129 is a deficient number, since it is larger than the sum of its proper divisors (188721631).

689972129 is a wasteful number, since it uses less digits than its factorization.

689972129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11261 (or 11250 counting only the distinct ones).

The product of its digits is 979776, while the sum is 53.

The square root of 689972129 is about 26267.3205523517. The cubic root of 689972129 is about 883.6436943193.

The spelling of 689972129 in words is "six hundred eighty-nine million, nine hundred seventy-two thousand, one hundred twenty-nine".