994253991 has 4 divisors (see below), whose sum is σ = 1325671992. Its totient is φ = 662835992.

The previous prime is 994253971. The next prime is 994254113. The reversal of 994253991 is 199352499.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 994253991 - 2⁶ = 994253927 is a prime.

It is a super-4 number, since 4×994253991⁴ (a number of 37 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (994253971) 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, 165708996 + ... + 165709001.

It is an arithmetic number, because the mean of its divisors is an integer number (331417998).

Almost surely, 2^994253991 is an apocalyptic number.

994253991 is a deficient number, since it is larger than the sum of its proper divisors (331418001).

994253991 is a wasteful number, since it uses less digits than its factorization.

994253991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331418000.

The product of its digits is 787320, while the sum is 51.

The square root of 994253991 is about 31531.7933362503. The cubic root of 994253991 is about 998.0809833976.

The spelling of 994253991 in words is "nine hundred ninety-four million, two hundred fifty-three thousand, nine hundred ninety-one".