161377129 has 2 divisors, whose sum is σ = 161377130. Its totient is φ = 161377128.

The previous prime is 161377109. The next prime is 161377157. The reversal of 161377129 is 921773161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130873600 + 30503529 = 11440^2 + 5523^2 .

It is a cyclic number.

It is not a de Polignac number, because 161377129 - 2¹⁵ = 161344361 is a prime.

It is equal to p_9047395 and since 161377129 and 9047395 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (161377109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80688564 + 80688565.

It is an arithmetic number, because the mean of its divisors is an integer number (80688565).

Almost surely, 2^161377129 is an apocalyptic number.

It is an amenable number.

161377129 is a deficient number, since it is larger than the sum of its proper divisors (1).

161377129 is an equidigital number, since it uses as much as digits as its factorization.

161377129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15876, while the sum is 37.

The square root of 161377129 is about 12703.4298124562. The cubic root of 161377129 is about 544.4366189521.

The spelling of 161377129 in words is "one hundred sixty-one million, three hundred seventy-seven thousand, one hundred twenty-nine".