814198621 has 4 divisors (see below), whose sum is σ = 857051200. Its totient is φ = 771346044.

The previous prime is 814198591. The next prime is 814198639. The reversal of 814198621 is 126891418.

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 814198621 - 2¹⁷ = 814067549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (814198921) 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, 21426261 + ... + 21426298.

It is an arithmetic number, because the mean of its divisors is an integer number (214262800).

Almost surely, 2^814198621 is an apocalyptic number.

It is an amenable number.

814198621 is a deficient number, since it is larger than the sum of its proper divisors (42852579).

814198621 is a wasteful number, since it uses less digits than its factorization.

814198621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42852578.

The product of its digits is 27648, while the sum is 40.

The square root of 814198621 is about 28534.1658542877. The cubic root of 814198621 is about 933.7776054829. Note that the first 3 decimals are identical.

The spelling of 814198621 in words is "eight hundred fourteen million, one hundred ninety-eight thousand, six hundred twenty-one".