1999442311 has 4 divisors (see below), whose sum is σ = 2000605824. Its totient is φ = 1998278800.

The previous prime is 1999442239. The next prime is 1999442317. The reversal of 1999442311 is 1132449991.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1132449991 = 7547 ⋅150053.

It is a cyclic number.

It is not a de Polignac number, because 1999442311 - 2¹³ = 1999434119 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 (1999442317) 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, 579175 + ... + 582616.

It is an arithmetic number, because the mean of its divisors is an integer number (500151456).

Almost surely, 2^1999442311 is an apocalyptic number.

1999442311 is a deficient number, since it is larger than the sum of its proper divisors (1163513).

1999442311 is a wasteful number, since it uses less digits than its factorization.

1999442311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1163512.

The product of its digits is 69984, while the sum is 43.

The square root of 1999442311 is about 44715.1239627042. The cubic root of 1999442311 is about 1259.8039316565.

The spelling of 1999442311 in words is "one billion, nine hundred ninety-nine million, four hundred forty-two thousand, three hundred eleven".