1630558945 has 4 divisors (see below), whose sum is σ = 1956670740. Its totient is φ = 1304447152.

The previous prime is 1630558913. The next prime is 1630558997. The reversal of 1630558945 is 5498550361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 543076416 + 1087482529 = 23304^2 + 32977^2 .

It is a cyclic number.

It is not a de Polignac number, because 1630558945 - 2⁵ = 1630558913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1630558895 and 1630558904.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 163055890 + ... + 163055899.

It is an arithmetic number, because the mean of its divisors is an integer number (489167685).

Almost surely, 2^1630558945 is an apocalyptic number.

It is an amenable number.

1630558945 is a deficient number, since it is larger than the sum of its proper divisors (326111795).

1630558945 is an equidigital number, since it uses as much as digits as its factorization.

1630558945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326111794.

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 1630558945 is about 40380.1801011338. The cubic root of 1630558945 is about 1177.0064273190.

The spelling of 1630558945 in words is "one billion, six hundred thirty million, five hundred fifty-eight thousand, nine hundred forty-five".