679155421 has 4 divisors (see below), whose sum is σ = 776177632. Its totient is φ = 582133212.

The previous prime is 679155413. The next prime is 679155439. The reversal of 679155421 is 124551976.

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 679155421 - 2³ = 679155413 is a prime.

It is a super-2 number, since 2×679155421² = 922504171747374482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (679155121) 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, 48511095 + ... + 48511108.

It is an arithmetic number, because the mean of its divisors is an integer number (194044408).

Almost surely, 2^679155421 is an apocalyptic number.

It is an amenable number.

679155421 is a deficient number, since it is larger than the sum of its proper divisors (97022211).

679155421 is an equidigital number, since it uses as much as digits as its factorization.

679155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97022210.

The product of its digits is 75600, while the sum is 40.

The square root of 679155421 is about 26060.6105262329. The cubic root of 679155421 is about 879.0017179139.

The spelling of 679155421 in words is "six hundred seventy-nine million, one hundred fifty-five thousand, four hundred twenty-one".