1634861993 has 2 divisors, whose sum is σ = 1634861994. Its totient is φ = 1634861992.

The previous prime is 1634861951. The next prime is 1634861999. The reversal of 1634861993 is 3991684361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1626750889 + 8111104 = 40333^2 + 2848^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1634861993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1634861999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817430996 + 817430997.

It is an arithmetic number, because the mean of its divisors is an integer number (817430997).

Almost surely, 2^1634861993 is an apocalyptic number.

It is an amenable number.

1634861993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1634861993 is an equidigital number, since it uses as much as digits as its factorization.

1634861993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The square root of 1634861993 is about 40433.4266789250. The cubic root of 1634861993 is about 1178.0408918963.

The spelling of 1634861993 in words is "one billion, six hundred thirty-four million, eight hundred sixty-one thousand, nine hundred ninety-three".