161386639 has 2 divisors, whose sum is σ = 161386640. Its totient is φ = 161386638.

The previous prime is 161386633. The next prime is 161386669. The reversal of 161386639 is 936683161.

161386639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161386639 - 2²⁵ = 127832207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161386595 and 161386604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161386633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80693319 + 80693320.

It is an arithmetic number, because the mean of its divisors is an integer number (80693320).

Almost surely, 2^161386639 is an apocalyptic number.

161386639 is a deficient number, since it is larger than the sum of its proper divisors (1).

161386639 is an equidigital number, since it uses as much as digits as its factorization.

161386639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 43.

The square root of 161386639 is about 12703.8041153034. The cubic root of 161386639 is about 544.4473133435.

The spelling of 161386639 in words is "one hundred sixty-one million, three hundred eighty-six thousand, six hundred thirty-nine".