161078639 has 2 divisors, whose sum is σ = 161078640. Its totient is φ = 161078638.

The previous prime is 161078629. The next prime is 161078651. The reversal of 161078639 is 936870161.

It is a weak prime.

It is an emirp because it is prime and its reverse (936870161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161078639 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 161078596 and 161078605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161078609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80539319 + 80539320.

It is an arithmetic number, because the mean of its divisors is an integer number (80539320).

Almost surely, 2^161078639 is an apocalyptic number.

161078639 is a deficient number, since it is larger than the sum of its proper divisors (1).

161078639 is an equidigital number, since it uses as much as digits as its factorization.

161078639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 161078639 is about 12691.6759728572. The cubic root of 161078639 is about 544.1007407416.

The spelling of 161078639 in words is "one hundred sixty-one million, seventy-eight thousand, six hundred thirty-nine".