247161009 has 4 divisors (see below), whose sum is σ = 329548016. Its totient is φ = 164774004.

The previous prime is 247160983. The next prime is 247161017. The reversal of 247161009 is 900161742.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 247161009 - 2⁹ = 247160497 is a prime.

It is a super-2 number, since 2×247161009² = 122177128739796162, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (247161209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41193499 + ... + 41193504.

It is an arithmetic number, because the mean of its divisors is an integer number (82387004).

Almost surely, 2^247161009 is an apocalyptic number.

It is an amenable number.

247161009 is a deficient number, since it is larger than the sum of its proper divisors (82387007).

247161009 is an equidigital number, since it uses as much as digits as its factorization.

247161009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82387006.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 247161009 is about 15721.3551896775. The cubic root of 247161009 is about 627.5668380629.

The spelling of 247161009 in words is "two hundred forty-seven million, one hundred sixty-one thousand, nine".