161772047 has 2 divisors, whose sum is σ = 161772048. Its totient is φ = 161772046.

The previous prime is 161772011. The next prime is 161772049. The reversal of 161772047 is 740277161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161772047 - 2²⁴ = 144994831 is a prime.

Together with 161772049, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_9068219 and since 161772047 and 9068219 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 161771998 and 161772016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161772049) 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, 80886023 + 80886024.

It is an arithmetic number, because the mean of its divisors is an integer number (80886024).

Almost surely, 2^161772047 is an apocalyptic number.

161772047 is a deficient number, since it is larger than the sum of its proper divisors (1).

161772047 is an equidigital number, since it uses as much as digits as its factorization.

161772047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 161772047 is about 12718.9640694516. The cubic root of 161772047 is about 544.8803676478.

The spelling of 161772047 in words is "one hundred sixty-one million, seven hundred seventy-two thousand, forty-seven".