1213103161 has 4 divisors (see below), whose sum is σ = 1220115492. Its totient is φ = 1206090832.

The previous prime is 1213103131. The next prime is 1213103219. The reversal of 1213103161 is 1613013121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1613013121 = 2851 ⋅565771.

It can be written as a sum of positive squares in 2 ways, for example, as 1119303936 + 93799225 = 33456^2 + 9685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213103161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213103131) 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, 3505906 + ... + 3506251.

It is an arithmetic number, because the mean of its divisors is an integer number (305028873).

Almost surely, 2^1213103161 is an apocalyptic number.

It is an amenable number.

1213103161 is a deficient number, since it is larger than the sum of its proper divisors (7012331).

1213103161 is an equidigital number, since it uses as much as digits as its factorization.

1213103161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7012330.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 1213103161 is about 34829.6305033516. The cubic root of 1213103161 is about 1066.5124055022.

Adding to 1213103161 its reverse (1613013121), we get a palindrome (2826116282).

The spelling of 1213103161 in words is "one billion, two hundred thirteen million, one hundred three thousand, one hundred sixty-one".