994151021 has 2 divisors, whose sum is σ = 994151022. Its totient is φ = 994151020.

The previous prime is 994150999. The next prime is 994151023. The reversal of 994151021 is 120151499.

994151021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 825930121 + 168220900 = 28739^2 + 12970^2 .

It is a cyclic number.

It is not a de Polignac number, because 994151021 - 2¹⁰ = 994149997 is a prime.

Together with 994151023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994151023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497075510 + 497075511.

It is an arithmetic number, because the mean of its divisors is an integer number (497075511).

Almost surely, 2^994151021 is an apocalyptic number.

It is an amenable number.

994151021 is a deficient number, since it is larger than the sum of its proper divisors (1).

994151021 is an equidigital number, since it uses as much as digits as its factorization.

994151021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 994151021 is about 31530.1604975300. The cubic root of 994151021 is about 998.0465267605.

The spelling of 994151021 in words is "nine hundred ninety-four million, one hundred fifty-one thousand, twenty-one".