106643639 has 2 divisors, whose sum is σ = 106643640. Its totient is φ = 106643638.

The previous prime is 106643609. The next prime is 106643651. The reversal of 106643639 is 936346601.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 106643639 - 2¹² = 106639543 is a prime.

It is a super-2 number, since 2×106643639² = 22745731478324642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (106643609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53321819 + 53321820.

It is an arithmetic number, because the mean of its divisors is an integer number (53321820).

Almost surely, 2^106643639 is an apocalyptic number.

106643639 is a deficient number, since it is larger than the sum of its proper divisors (1).

106643639 is an equidigital number, since it uses as much as digits as its factorization.

106643639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 106643639 is about 10326.8407075930. The cubic root of 106643639 is about 474.2183102452.

The spelling of 106643639 in words is "one hundred six million, six hundred forty-three thousand, six hundred thirty-nine".