161547977 has 4 divisors (see below), whose sum is σ = 164985216. Its totient is φ = 158110740.

The previous prime is 161547961. The next prime is 161548039. The reversal of 161547977 is 779745161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161547977 - 2⁴ = 161547961 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 3437191 = 161547977 / (1 + 6 + 1 + 5 + 4 + 7 + 9 + 7 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161547907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1718549 + ... + 1718642.

It is an arithmetic number, because the mean of its divisors is an integer number (41246304).

Almost surely, 2^161547977 is an apocalyptic number.

It is an amenable number.

161547977 is a deficient number, since it is larger than the sum of its proper divisors (3437239).

161547977 is an equidigital number, since it uses as much as digits as its factorization.

161547977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3437238.

The product of its digits is 370440, while the sum is 47.

The square root of 161547977 is about 12710.1525167875. The cubic root of 161547977 is about 544.6286806617.

The spelling of 161547977 in words is "one hundred sixty-one million, five hundred forty-seven thousand, nine hundred seventy-seven".