689021031 has 16 divisors (see below), whose sum is σ = 941941728. Its totient is φ = 447744000.

The previous prime is 689021029. The next prime is 689021059. The reversal of 689021031 is 130120986.

It is not a de Polignac number, because 689021031 - 2¹ = 689021029 is a prime.

It is a super-2 number, since 2×689021031² = 949499962320605922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 689021031.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689021131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 207081 + ... + 210381.

It is an arithmetic number, because the mean of its divisors is an integer number (58871358).

Almost surely, 2^689021031 is an apocalyptic number.

689021031 is a deficient number, since it is larger than the sum of its proper divisors (252920697).

689021031 is a wasteful number, since it uses less digits than its factorization.

689021031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5042.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 689021031 is about 26249.2101024012. The cubic root of 689021031 is about 883.2374855379.

The spelling of 689021031 in words is "six hundred eighty-nine million, twenty-one thousand, thirty-one".