699644849 has 2 divisors, whose sum is σ = 699644850. Its totient is φ = 699644848.

The previous prime is 699644839. The next prime is 699644851. The reversal of 699644849 is 948446996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698280625 + 1364224 = 26425^2 + 1168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-699644849 is a prime.

Together with 699644851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (699644839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349822424 + 349822425.

It is an arithmetic number, because the mean of its divisors is an integer number (349822425).

Almost surely, 2^699644849 is an apocalyptic number.

It is an amenable number.

699644849 is a deficient number, since it is larger than the sum of its proper divisors (1).

699644849 is an equidigital number, since it uses as much as digits as its factorization.

699644849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13436928, while the sum is 59.

The square root of 699644849 is about 26450.8005360896. The cubic root of 699644849 is about 887.7538144382.

The spelling of 699644849 in words is "six hundred ninety-nine million, six hundred forty-four thousand, eight hundred forty-nine".