1630745947 has 2 divisors, whose sum is σ = 1630745948. Its totient is φ = 1630745946.

The previous prime is 1630745939. The next prime is 1630745957. The reversal of 1630745947 is 7495470361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1630745947 - 2³ = 1630745939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1630745897 and 1630745906.

It is not a weakly prime, because it can be changed into another prime (1630745957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815372973 + 815372974.

It is an arithmetic number, because the mean of its divisors is an integer number (815372974).

Almost surely, 2^1630745947 is an apocalyptic number.

1630745947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630745947 is an equidigital number, since it uses as much as digits as its factorization.

1630745947 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 1630745947 is about 40382.4955519096. The cubic root of 1630745947 is about 1177.0514209172.

The spelling of 1630745947 in words is "one billion, six hundred thirty million, seven hundred forty-five thousand, nine hundred forty-seven".