1994603281 has 4 divisors (see below), whose sum is σ = 2175930864. Its totient is φ = 1813275700.

The previous prime is 1994603239. The next prime is 1994603287. The reversal of 1994603281 is 1823064991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1994603281 - 2⁷ = 1994603153 is a prime.

It is a super-2 number, since 2×1994603281² = 7956884497151929922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1994603287) 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, 90663775 + ... + 90663796.

It is an arithmetic number, because the mean of its divisors is an integer number (543982716).

Almost surely, 2^1994603281 is an apocalyptic number.

1994603281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1994603281 is a deficient number, since it is larger than the sum of its proper divisors (181327583).

1994603281 is a wasteful number, since it uses less digits than its factorization.

1994603281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181327582.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 1994603281 is about 44660.9816394579. The cubic root of 1994603281 is about 1258.7867890897.

The spelling of 1994603281 in words is "one billion, nine hundred ninety-four million, six hundred three thousand, two hundred eighty-one".