161577049 has 2 divisors, whose sum is σ = 161577050. Its totient is φ = 161577048.

The previous prime is 161577029. The next prime is 161577077. The reversal of 161577049 is 940775161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150307600 + 11269449 = 12260^2 + 3357^2 .

It is a cyclic number.

It is not a de Polignac number, because 161577049 - 2¹⁹ = 161052761 is a prime.

It is a super-2 number, since 2×161577049² = 52214285527096802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161577029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80788524 + 80788525.

It is an arithmetic number, because the mean of its divisors is an integer number (80788525).

Almost surely, 2^161577049 is an apocalyptic number.

It is an amenable number.

161577049 is a deficient number, since it is larger than the sum of its proper divisors (1).

161577049 is an equidigital number, since it uses as much as digits as its factorization.

161577049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 161577049 is about 12711.2961180204. The cubic root of 161577049 is about 544.6613489657.

The spelling of 161577049 in words is "one hundred sixty-one million, five hundred seventy-seven thousand, forty-nine".