638011079 has 2 divisors, whose sum is σ = 638011080. Its totient is φ = 638011078.

The previous prime is 638011069. The next prime is 638011097. The reversal of 638011079 is 970110836.

Together with next prime (638011097) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 638011079 - 2¹² = 638006983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (638011069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319005539 + 319005540.

It is an arithmetic number, because the mean of its divisors is an integer number (319005540).

Almost surely, 2^638011079 is an apocalyptic number.

638011079 is a deficient number, since it is larger than the sum of its proper divisors (1).

638011079 is an equidigital number, since it uses as much as digits as its factorization.

638011079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 638011079 is about 25258.8811905832. The cubic root of 638011079 is about 860.8802412432.

The spelling of 638011079 in words is "six hundred thirty-eight million, eleven thousand, seventy-nine".