638080121 has 4 divisors (see below), whose sum is σ = 729234432. Its totient is φ = 546925812.

The previous prime is 638080117. The next prime is 638080123. The reversal of 638080121 is 121080836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638080121 - 2² = 638080117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (638080123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45577145 + ... + 45577158.

It is an arithmetic number, because the mean of its divisors is an integer number (182308608).

Almost surely, 2^638080121 is an apocalyptic number.

It is an amenable number.

638080121 is a deficient number, since it is larger than the sum of its proper divisors (91154311).

638080121 is an equidigital number, since it uses as much as digits as its factorization.

638080121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91154310.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 638080121 is about 25260.2478412228. The cubic root of 638080121 is about 860.9112933423.

The spelling of 638080121 in words is "six hundred thirty-eight million, eighty thousand, one hundred twenty-one".