994153621 has 2 divisors, whose sum is σ = 994153622. Its totient is φ = 994153620.

The previous prime is 994153613. The next prime is 994153697. The reversal of 994153621 is 126351499.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 666362596 + 327791025 = 25814^2 + 18105^2 .

It is an emirp because it is prime and its reverse (126351499) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 994153621 - 2³ = 994153613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (994153921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497076810 + 497076811.

It is an arithmetic number, because the mean of its divisors is an integer number (497076811).

Almost surely, 2^994153621 is an apocalyptic number.

It is an amenable number.

994153621 is a deficient number, since it is larger than the sum of its proper divisors (1).

994153621 is an equidigital number, since it uses as much as digits as its factorization.

994153621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320, while the sum is 40.

The square root of 994153621 is about 31530.2017278672. The cubic root of 994153621 is about 998.0473968224.

The spelling of 994153621 in words is "nine hundred ninety-four million, one hundred fifty-three thousand, six hundred twenty-one".