1679271621 has 4 divisors (see below), whose sum is σ = 2239028832. Its totient is φ = 1119514412.

The previous prime is 1679271617. The next prime is 1679271631. The reversal of 1679271621 is 1261729761.

It is a happy number.

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 1679271621 - 2² = 1679271617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1679271631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 279878601 + ... + 279878606.

It is an arithmetic number, because the mean of its divisors is an integer number (559757208).

Almost surely, 2^1679271621 is an apocalyptic number.

It is an amenable number.

1679271621 is a deficient number, since it is larger than the sum of its proper divisors (559757211).

1679271621 is an equidigital number, since it uses as much as digits as its factorization.

1679271621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559757210.

The product of its digits is 63504, while the sum is 42.

The square root of 1679271621 is about 40978.9167865623. The cubic root of 1679271621 is about 1188.6125630222.

The spelling of 1679271621 in words is "one billion, six hundred seventy-nine million, two hundred seventy-one thousand, six hundred twenty-one".