161564047 has 2 divisors, whose sum is σ = 161564048. Its totient is φ = 161564046.

The previous prime is 161564021. The next prime is 161564057. The reversal of 161564047 is 740465161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161564047 - 2²³ = 153175439 is a prime.

It is a super-2 number, since 2×161564047² = 52205882566036418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161564057) 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, 80782023 + 80782024.

It is an arithmetic number, because the mean of its divisors is an integer number (80782024).

Almost surely, 2^161564047 is an apocalyptic number.

161564047 is a deficient number, since it is larger than the sum of its proper divisors (1).

161564047 is an equidigital number, since it uses as much as digits as its factorization.

161564047 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 161564047 is about 12710.7846728674. The cubic root of 161564047 is about 544.6467390591.

The spelling of 161564047 in words is "one hundred sixty-one million, five hundred sixty-four thousand, forty-seven".