1631748949 has 2 divisors, whose sum is σ = 1631748950. Its totient is φ = 1631748948.

The previous prime is 1631748931. The next prime is 1631748971. The reversal of 1631748949 is 9498471361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1527402724 + 104346225 = 39082^2 + 10215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631748949 - 2⁵ = 1631748917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1631748896 and 1631748905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1631748919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815874474 + 815874475.

It is an arithmetic number, because the mean of its divisors is an integer number (815874475).

Almost surely, 2^1631748949 is an apocalyptic number.

It is an amenable number.

1631748949 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631748949 is an equidigital number, since it uses as much as digits as its factorization.

1631748949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 1631748949 is about 40394.9124148079. The cubic root of 1631748949 is about 1177.2926894344.

The spelling of 1631748949 in words is "one billion, six hundred thirty-one million, seven hundred forty-eight thousand, nine hundred forty-nine".