1994011757 has 2 divisors, whose sum is σ = 1994011758. Its totient is φ = 1994011756.

The previous prime is 1994011709. The next prime is 1994011759. The reversal of 1994011757 is 7571104991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1993979716 + 32041 = 44654^2 + 179^2 .

It is a cyclic number.

It is not a de Polignac number, because 1994011757 - 2⁸ = 1994011501 is a prime.

Together with 1994011759, 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 (1994011759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997005878 + 997005879.

It is an arithmetic number, because the mean of its divisors is an integer number (997005879).

Almost surely, 2^1994011757 is an apocalyptic number.

It is an amenable number.

1994011757 is a deficient number, since it is larger than the sum of its proper divisors (1).

1994011757 is an equidigital number, since it uses as much as digits as its factorization.

1994011757 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 79380, while the sum is 44.

The square root of 1994011757 is about 44654.3587682099. The cubic root of 1994011757 is about 1258.6623405803.

The spelling of 1994011757 in words is "one billion, nine hundred ninety-four million, eleven thousand, seven hundred fifty-seven".