1228316621 has 4 divisors (see below), whose sum is σ = 1403790432. Its totient is φ = 1052842812.

The previous prime is 1228316611. The next prime is 1228316669. The reversal of 1228316621 is 1266138221.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1266138221 = 331 ⋅3825191.

It is a de Polignac number, because none of the positive numbers 2^k-1228316621 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 (1228316611) 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, 87736895 + ... + 87736908.

It is an arithmetic number, because the mean of its divisors is an integer number (350947608).

Almost surely, 2^1228316621 is an apocalyptic number.

It is an amenable number.

1228316621 is a deficient number, since it is larger than the sum of its proper divisors (175473811).

1228316621 is an equidigital number, since it uses as much as digits as its factorization.

1228316621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175473810.

The product of its digits is 6912, while the sum is 32.

The square root of 1228316621 is about 35047.3482734429. The cubic root of 1228316621 is about 1070.9522547365.

The spelling of 1228316621 in words is "one billion, two hundred twenty-eight million, three hundred sixteen thousand, six hundred twenty-one".