994728121 has 2 divisors, whose sum is σ = 994728122. Its totient is φ = 994728120.

The previous prime is 994728103. The next prime is 994728131. The reversal of 994728121 is 121827499.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994708521 + 19600 = 31539^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 994728121 - 2²³ = 986339513 is a prime.

It is not a weakly prime, because it can be changed into another prime (994728131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497364060 + 497364061.

It is an arithmetic number, because the mean of its divisors is an integer number (497364061).

Almost surely, 2^994728121 is an apocalyptic number.

It is an amenable number.

994728121 is a deficient number, since it is larger than the sum of its proper divisors (1).

994728121 is an equidigital number, since it uses as much as digits as its factorization.

994728121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 43.

The square root of 994728121 is about 31539.3107248716. The cubic root of 994728121 is about 998.2396098450.

The spelling of 994728121 in words is "nine hundred ninety-four million, seven hundred twenty-eight thousand, one hundred twenty-one".