161493247 has 2 divisors, whose sum is σ = 161493248. Its totient is φ = 161493246.

The previous prime is 161493223. The next prime is 161493287. The reversal of 161493247 is 742394161.

161493247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161493247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161493287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80746623 + 80746624.

It is an arithmetic number, because the mean of its divisors is an integer number (80746624).

Almost surely, 2^161493247 is an apocalyptic number.

161493247 is a deficient number, since it is larger than the sum of its proper divisors (1).

161493247 is an equidigital number, since it uses as much as digits as its factorization.

161493247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 161493247 is about 12707.9993311300. Note that the first 3 decimals coincide. The cubic root of 161493247 is about 544.5671697409.

The spelling of 161493247 in words is "one hundred sixty-one million, four hundred ninety-three thousand, two hundred forty-seven".