161947449 has 6 divisors (see below), whose sum is σ = 233924106. Its totient is φ = 107964960.

The previous prime is 161947447. The next prime is 161947451. The reversal of 161947449 is 944749161.

161947449 is a `hidden beast` number, since 16 + 194 + 7 + 449 = 666.

It is an interprime number because it is at equal distance from previous prime (161947447) and next prime (161947451).

It can be written as a sum of positive squares in only one way, i.e., 160275600 + 1671849 = 12660^2 + 1293^2 .

It is not a de Polignac number, because 161947449 - 2¹ = 161947447 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161947447) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8997072 + ... + 8997089.

It is an arithmetic number, because the mean of its divisors is an integer number (38987351).

Almost surely, 2^161947449 is an apocalyptic number.

It is an amenable number.

161947449 is a deficient number, since it is larger than the sum of its proper divisors (71976657).

161947449 is a wasteful number, since it uses less digits than its factorization.

161947449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17994167 (or 17994164 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 161947449 is about 12725.8574956661. The cubic root of 161947449 is about 545.0772261017.

The spelling of 161947449 in words is "one hundred sixty-one million, nine hundred forty-seven thousand, four hundred forty-nine".