1009943161 has 4 divisors (see below), whose sum is σ = 1010158324. Its totient is φ = 1009728000.

The previous prime is 1009943149. The next prime is 1009943167. The reversal of 1009943161 is 1613499001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1613499001 = 83 ⋅19439747.

It can be written as a sum of positive squares in 2 ways, for example, as 681210000 + 328733161 = 26100^2 + 18131^2 .

It is a cyclic number.

It is not a de Polignac number, because 1009943161 - 2¹¹ = 1009941113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1009943167) 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, 100380 + ... + 109981.

It is an arithmetic number, because the mean of its divisors is an integer number (252539581).

Almost surely, 2^1009943161 is an apocalyptic number.

It is an amenable number.

1009943161 is a deficient number, since it is larger than the sum of its proper divisors (215163).

1009943161 is an equidigital number, since it uses as much as digits as its factorization.

1009943161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215162.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 1009943161 is about 31779.6029081548. The cubic root of 1009943161 is about 1003.3034621213.

The spelling of 1009943161 in words is "one billion, nine million, nine hundred forty-three thousand, one hundred sixty-one".