161370009 has 16 divisors (see below), whose sum is σ = 239424640. Its totient is φ = 107418960.

The previous prime is 161369993. The next prime is 161370049. The reversal of 161370009 is 900073161.

It is not a de Polignac number, because 161370009 - 2⁴ = 161369993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161370049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15519 + ... + 23739.

It is an arithmetic number, because the mean of its divisors is an integer number (14964040).

Almost surely, 2^161370009 is an apocalyptic number.

It is an amenable number.

161370009 is a deficient number, since it is larger than the sum of its proper divisors (78054631).

161370009 is an equidigital number, since it uses as much as digits as its factorization.

161370009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8957 (or 8951 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 27.

The square root of 161370009 is about 12703.1495700869. The cubic root of 161370009 is about 544.4286119403.

The spelling of 161370009 in words is "one hundred sixty-one million, three hundred seventy thousand, nine".