1242113161 has 2 divisors, whose sum is σ = 1242113162. Its totient is φ = 1242113160.

The previous prime is 1242113113. The next prime is 1242113189. The reversal of 1242113161 is 1613112421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100978761 + 141134400 = 33181^2 + 11880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1242113161 - 2¹⁵ = 1242080393 is a prime.

It is not a weakly prime, because it can be changed into another prime (1242113261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621056580 + 621056581.

It is an arithmetic number, because the mean of its divisors is an integer number (621056581).

Almost surely, 2^1242113161 is an apocalyptic number.

It is an amenable number.

1242113161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242113161 is an equidigital number, since it uses as much as digits as its factorization.

1242113161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 1242113161 is about 35243.6258208488. The cubic root of 1242113161 is about 1074.9470061491.

Adding to 1242113161 its reverse (1613112421), we get a palindrome (2855225582).

The spelling of 1242113161 in words is "one billion, two hundred forty-two million, one hundred thirteen thousand, one hundred sixty-one".