699868991 has 2 divisors, whose sum is σ = 699868992. Its totient is φ = 699868990.

The previous prime is 699868987. The next prime is 699868993. The reversal of 699868991 is 199868996.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 699868991 - 2² = 699868987 is a prime.

Together with 699868993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699868993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349934495 + 349934496.

It is an arithmetic number, because the mean of its divisors is an integer number (349934496).

Almost surely, 2^699868991 is an apocalyptic number.

699868991 is a deficient number, since it is larger than the sum of its proper divisors (1).

699868991 is an equidigital number, since it uses as much as digits as its factorization.

699868991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15116544, while the sum is 65.

The square root of 699868991 is about 26455.0371574111. The cubic root of 699868991 is about 887.8486061840.

The spelling of 699868991 in words is "six hundred ninety-nine million, eight hundred sixty-eight thousand, nine hundred ninety-one".