161008877 has 2 divisors, whose sum is σ = 161008878. Its totient is φ = 161008876.

The previous prime is 161008811. The next prime is 161008919. The reversal of 161008877 is 778800161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110229001 + 50779876 = 10499^2 + 7126^2 .

It is a cyclic number.

It is not a de Polignac number, because 161008877 - 2⁸ = 161008621 is a prime.

It is a super-2 number, since 2×161008877² = 51847716945602258, which contains 22 as substring.

It is equal to p_9027983 and since 161008877 and 9027983 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161008877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161008577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80504438 + 80504439.

It is an arithmetic number, because the mean of its divisors is an integer number (80504439).

Almost surely, 2^161008877 is an apocalyptic number.

It is an amenable number.

161008877 is a deficient number, since it is larger than the sum of its proper divisors (1).

161008877 is an equidigital number, since it uses as much as digits as its factorization.

161008877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 161008877 is about 12688.9273384317. The cubic root of 161008877 is about 544.0221806934.

The spelling of 161008877 in words is "one hundred sixty-one million, eight thousand, eight hundred seventy-seven".