689502139 has 2 divisors, whose sum is σ = 689502140. Its totient is φ = 689502138.

The previous prime is 689502113. The next prime is 689502179. The reversal of 689502139 is 931205986.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 689502139 - 2¹⁵ = 689469371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689502095 and 689502104.

It is not a weakly prime, because it can be changed into another prime (689502109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344751069 + 344751070.

It is an arithmetic number, because the mean of its divisors is an integer number (344751070).

Almost surely, 2^689502139 is an apocalyptic number.

689502139 is a deficient number, since it is larger than the sum of its proper divisors (1).

689502139 is an equidigital number, since it uses as much as digits as its factorization.

689502139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 689502139 is about 26258.3727408992. The cubic root of 689502139 is about 883.4430108347.

The spelling of 689502139 in words is "six hundred eighty-nine million, five hundred two thousand, one hundred thirty-nine".