689988701 has 2 divisors, whose sum is σ = 689988702. Its totient is φ = 689988700.

The previous prime is 689988647. The next prime is 689988727. The reversal of 689988701 is 107889986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575520100 + 114468601 = 23990^2 + 10699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689988701 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (689988001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344994350 + 344994351.

It is an arithmetic number, because the mean of its divisors is an integer number (344994351).

Almost surely, 2^689988701 is an apocalyptic number.

It is an amenable number.

689988701 is a deficient number, since it is larger than the sum of its proper divisors (1).

689988701 is an equidigital number, since it uses as much as digits as its factorization.

689988701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1741824, while the sum is 56.

The square root of 689988701 is about 26267.6359994576. The cubic root of 689988701 is about 883.6507688205.

The spelling of 689988701 in words is "six hundred eighty-nine million, nine hundred eighty-eight thousand, seven hundred one".