699718121 has 4 divisors (see below), whose sum is σ = 730140672. Its totient is φ = 669295572.

The previous prime is 699718099. The next prime is 699718139. The reversal of 699718121 is 121817996.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 699718121 - 2¹⁰ = 699717097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699718141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15211241 + ... + 15211286.

It is an arithmetic number, because the mean of its divisors is an integer number (182535168).

Almost surely, 2^699718121 is an apocalyptic number.

It is an amenable number.

699718121 is a deficient number, since it is larger than the sum of its proper divisors (30422551).

699718121 is a wasteful number, since it uses less digits than its factorization.

699718121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30422550.

The product of its digits is 54432, while the sum is 44.

The square root of 699718121 is about 26452.1855618775. The cubic root of 699718121 is about 887.7848040786.

The spelling of 699718121 in words is "six hundred ninety-nine million, seven hundred eighteen thousand, one hundred twenty-one".