1231053161 has 8 divisors (see below), whose sum is σ = 1371465480. Its totient is φ = 1097171712.

The previous prime is 1231053151. The next prime is 1231053191. The reversal of 1231053161 is 1613501321.

It can be written as a sum of positive squares in 4 ways, for example, as 387499225 + 843553936 = 19685^2 + 29044^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231053161 - 2⁶ = 1231053097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231053151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1632320 + ... + 1633073.

It is an arithmetic number, because the mean of its divisors is an integer number (171433185).

Almost surely, 2^1231053161 is an apocalyptic number.

It is an amenable number.

1231053161 is a deficient number, since it is larger than the sum of its proper divisors (140412319).

1231053161 is a wasteful number, since it uses less digits than its factorization.

1231053161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265435.

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 1231053161 is about 35086.3671673201. The cubic root of 1231053161 is about 1071.7469819553.

Adding to 1231053161 its reverse (1613501321), we get a palindrome (2844554482).

The spelling of 1231053161 in words is "one billion, two hundred thirty-one million, fifty-three thousand, one hundred sixty-one".