164431639 has 2 divisors, whose sum is σ = 164431640. Its totient is φ = 164431638.

The previous prime is 164431591. The next prime is 164431679. The reversal of 164431639 is 936134461.

164431639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164431639 - 2¹⁹ = 163907351 is a prime.

It is a super-3 number, since 3×164431639³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 164431598 and 164431607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164431679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82215819 + 82215820.

It is an arithmetic number, because the mean of its divisors is an integer number (82215820).

Almost surely, 2^164431639 is an apocalyptic number.

164431639 is a deficient number, since it is larger than the sum of its proper divisors (1).

164431639 is an equidigital number, since it uses as much as digits as its factorization.

164431639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 37.

The square root of 164431639 is about 12823.0900722096. The cubic root of 164431639 is about 547.8501630500.

The spelling of 164431639 in words is "one hundred sixty-four million, four hundred thirty-one thousand, six hundred thirty-nine".