2251009994 has 4 divisors (see below), whose sum is σ = 3376514994. Its totient is φ = 1125504996.

The previous prime is 2251009987. The next prime is 2251009997. The reversal of 2251009994 is 4999001522.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2243253769 + 7756225 = 47363^2 + 2785^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2251009997) 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 as a sum of consecutive naturals, namely, 562752497 + ... + 562752500.

Almost surely, 2^2251009994 is an apocalyptic number.

2251009994 is a deficient number, since it is larger than the sum of its proper divisors (1125505000).

2251009994 is a wasteful number, since it uses less digits than its factorization.

2251009994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125504999.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 2251009994 is about 47444.8099795963. The cubic root of 2251009994 is about 1310.5667368915.

The spelling of 2251009994 in words is "two billion, two hundred fifty-one million, nine thousand, nine hundred ninety-four".