1999227601 has 4 divisors (see below), whose sum is σ = 2284831552. Its totient is φ = 1713623652.

The previous prime is 1999227599. The next prime is 1999227613. The reversal of 1999227601 is 1067229991.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1067229991 = 3203 ⋅333197.

It is a cyclic number.

It is not a de Polignac number, because 1999227601 - 2¹ = 1999227599 is a prime.

It is a super-3 number, since 3×1999227601³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1999227001) 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, 142801965 + ... + 142801978.

It is an arithmetic number, because the mean of its divisors is an integer number (571207888).

Almost surely, 2^1999227601 is an apocalyptic number.

It is an amenable number.

1999227601 is a deficient number, since it is larger than the sum of its proper divisors (285603951).

1999227601 is an equidigital number, since it uses as much as digits as its factorization.

1999227601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285603950.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1999227601 is about 44712.7230327118. The cubic root of 1999227601 is about 1259.7588353842.

The spelling of 1999227601 in words is "one billion, nine hundred ninety-nine million, two hundred twenty-seven thousand, six hundred one".