699123679 has 2 divisors, whose sum is σ = 699123680. Its totient is φ = 699123678.

The previous prime is 699123661. The next prime is 699123703. The reversal of 699123679 is 976321996.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 699123679 - 2¹⁷ = 698992607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (699123629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 349561839 + 349561840.

It is an arithmetic number, because the mean of its divisors is an integer number (349561840).

Almost surely, 2^699123679 is an apocalyptic number.

699123679 is a deficient number, since it is larger than the sum of its proper divisors (1).

699123679 is an equidigital number, since it uses as much as digits as its factorization.

699123679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1102248, while the sum is 52.

The square root of 699123679 is about 26440.9470140538. The cubic root of 699123679 is about 887.5333284846.

The spelling of 699123679 in words is "six hundred ninety-nine million, one hundred twenty-three thousand, six hundred seventy-nine".