994021331 has 16 divisors (see below), whose sum is σ = 1068228000. Its totient is φ = 921643008.

The previous prime is 994021277. The next prime is 994021349. The reversal of 994021331 is 133120499.

It is a cyclic number.

It is not a de Polignac number, because 994021331 - 2⁶ = 994021267 is a prime.

It is a super-2 number, since 2×994021331² = 1976156812966023122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (994021531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 472520 + ... + 474618.

It is an arithmetic number, because the mean of its divisors is an integer number (66764250).

Almost surely, 2^994021331 is an apocalyptic number.

994021331 is a deficient number, since it is larger than the sum of its proper divisors (74206669).

994021331 is a wasteful number, since it uses less digits than its factorization.

994021331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 994021331 is about 31528.1038281721. The cubic root of 994021331 is about 998.0031254797.

The spelling of 994021331 in words is "nine hundred ninety-four million, twenty-one thousand, three hundred thirty-one".