1356261161 has 2 divisors, whose sum is σ = 1356261162. Its totient is φ = 1356261160.

The previous prime is 1356261131. The next prime is 1356261163. The reversal of 1356261161 is 1611626531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1047169600 + 309091561 = 32360^2 + 17581^2 .

It is a cyclic number.

It is not a de Polignac number, because 1356261161 - 2¹⁴ = 1356244777 is a prime.

Together with 1356261163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1356261163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 678130580 + 678130581.

It is an arithmetic number, because the mean of its divisors is an integer number (678130581).

Almost surely, 2^1356261161 is an apocalyptic number.

It is an amenable number.

1356261161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1356261161 is an equidigital number, since it uses as much as digits as its factorization.

1356261161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 1356261161 is about 36827.4511879386. The cubic root of 1356261161 is about 1106.9154307928.

Adding to 1356261161 its reverse (1611626531), we get a palindrome (2967887692).

The spelling of 1356261161 in words is "one billion, three hundred fifty-six million, two hundred sixty-one thousand, one hundred sixty-one".