699444989 has 2 divisors, whose sum is σ = 699444990. Its totient is φ = 699444988.

The previous prime is 699444979. The next prime is 699445013. The reversal of 699444989 is 989444996.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 696696025 + 2748964 = 26395^2 + 1658^2 .

It is a cyclic number.

It is not a de Polignac number, because 699444989 - 2¹⁶ = 699379453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699444919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349722494 + 349722495.

It is an arithmetic number, because the mean of its divisors is an integer number (349722495).

Almost surely, 2^699444989 is an apocalyptic number.

It is an amenable number.

699444989 is a deficient number, since it is larger than the sum of its proper divisors (1).

699444989 is an equidigital number, since it uses as much as digits as its factorization.

699444989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20155392, while the sum is 62.

The square root of 699444989 is about 26447.0223087591. The cubic root of 699444989 is about 887.6692747012.

The spelling of 699444989 in words is "six hundred ninety-nine million, four hundred forty-four thousand, nine hundred eighty-nine".