1123199621 has 2 divisors, whose sum is σ = 1123199622. Its totient is φ = 1123199620.

The previous prime is 1123199563. The next prime is 1123199659. The reversal of 1123199621 is 1269913211.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 914397121 + 208802500 = 30239^2 + 14450^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123199621 is a prime.

It is a super-2 number, since 2×1123199621² = 2523154777229087282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123199221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561599810 + 561599811.

It is an arithmetic number, because the mean of its divisors is an integer number (561599811).

Almost surely, 2^1123199621 is an apocalyptic number.

It is an amenable number.

1123199621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123199621 is an equidigital number, since it uses as much as digits as its factorization.

1123199621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 35.

The square root of 1123199621 is about 33514.1704507213. The cubic root of 1123199621 is about 1039.4868094915.

The spelling of 1123199621 in words is "one billion, one hundred twenty-three million, one hundred ninety-nine thousand, six hundred twenty-one".