161638847 has 2 divisors, whose sum is σ = 161638848. Its totient is φ = 161638846.

The previous prime is 161638843. The next prime is 161638859. The reversal of 161638847 is 748836161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161638847 - 2² = 161638843 is a prime.

It is a super-2 number, since 2×161638847² = 52254233718978818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161638798 and 161638807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161638843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80819423 + 80819424.

It is an arithmetic number, because the mean of its divisors is an integer number (80819424).

Almost surely, 2^161638847 is an apocalyptic number.

161638847 is a deficient number, since it is larger than the sum of its proper divisors (1).

161638847 is an equidigital number, since it uses as much as digits as its factorization.

161638847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 44.

The square root of 161638847 is about 12713.7267156409. The cubic root of 161638847 is about 544.7307785702.

The spelling of 161638847 in words is "one hundred sixty-one million, six hundred thirty-eight thousand, eight hundred forty-seven".