1994744641 has 2 divisors, whose sum is σ = 1994744642. Its totient is φ = 1994744640.

The previous prime is 1994744639. The next prime is 1994744723. The reversal of 1994744641 is 1464474991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1972692225 + 22052416 = 44415^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994744641 - 2¹ = 1994744639 is a prime.

Together with 1994744639, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1994744441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997372320 + 997372321.

It is an arithmetic number, because the mean of its divisors is an integer number (997372321).

Almost surely, 2^1994744641 is an apocalyptic number.

It is an amenable number.

1994744641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994744641 is an equidigital number, since it uses as much as digits as its factorization.

1994744641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 49.

The square root of 1994744641 is about 44662.5642009054. The cubic root of 1994744641 is about 1258.8165256458.

The spelling of 1994744641 in words is "one billion, nine hundred ninety-four million, seven hundred forty-four thousand, six hundred forty-one".