161930077 has 2 divisors, whose sum is σ = 161930078. Its totient is φ = 161930076.

The previous prime is 161930063. The next prime is 161930099. The reversal of 161930077 is 770039161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106069401 + 55860676 = 10299^2 + 7474^2 .

It is a cyclic number.

It is not a de Polignac number, because 161930077 - 2⁷ = 161929949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161930177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80965038 + 80965039.

It is an arithmetic number, because the mean of its divisors is an integer number (80965039).

Almost surely, 2^161930077 is an apocalyptic number.

It is an amenable number.

161930077 is a deficient number, since it is larger than the sum of its proper divisors (1).

161930077 is an equidigital number, since it uses as much as digits as its factorization.

161930077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 34.

The square root of 161930077 is about 12725.1749300353. The cubic root of 161930077 is about 545.0577353755.

The spelling of 161930077 in words is "one hundred sixty-one million, nine hundred thirty thousand, seventy-seven".