1638263241 has 6 divisors (see below), whose sum is σ = 2366380250. Its totient is φ = 1092175488.

The previous prime is 1638263131. The next prime is 1638263243. The reversal of 1638263241 is 1423628361.

1638263241 is a `hidden beast` number, since 16 + 3 + 8 + 2 + 632 + 4 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 900000000 + 738263241 = 30000^2 + 27171^2 .

It is not a de Polignac number, because 1638263241 - 2¹⁷ = 1638132169 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1638263196 and 1638263205.

It is not an unprimeable number, because it can be changed into a prime (1638263243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91014616 + ... + 91014633.

Almost surely, 2^1638263241 is an apocalyptic number.

It is an amenable number.

1638263241 is a deficient number, since it is larger than the sum of its proper divisors (728117009).

1638263241 is a wasteful number, since it uses less digits than its factorization.

1638263241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182029255 (or 182029252 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 1638263241 is about 40475.4646792350. The cubic root of 1638263241 is about 1178.8572775804.

The spelling of 1638263241 in words is "one billion, six hundred thirty-eight million, two hundred sixty-three thousand, two hundred forty-one".