1994511433 has 8 divisors (see below), whose sum is σ = 2002582728. Its totient is φ = 1986451584.

The previous prime is 1994511419. The next prime is 1994511439. The reversal of 1994511433 is 3341154991.

It can be written as a sum of positive squares in 4 ways, for example, as 58247424 + 1936264009 = 7632^2 + 44003^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1994511433 is a prime.

It is a super-3 number, since 3×1994511433³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994511439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 540591 + ... + 544267.

It is an arithmetic number, because the mean of its divisors is an integer number (250322841).

Almost surely, 2^1994511433 is an apocalyptic number.

It is an amenable number.

1994511433 is a deficient number, since it is larger than the sum of its proper divisors (8071295).

1994511433 is a wasteful number, since it uses less digits than its factorization.

1994511433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723.

The product of its digits is 58320, while the sum is 40.

The square root of 1994511433 is about 44659.9533474902. The cubic root of 1994511433 is about 1258.7674671482.

The spelling of 1994511433 in words is "one billion, nine hundred ninety-four million, five hundred eleven thousand, four hundred thirty-three".