1020118261 has 2 divisors, whose sum is σ = 1020118262. Its totient is φ = 1020118260.

The previous prime is 1020118243. The next prime is 1020118289. The reversal of 1020118261 is 1628110201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664041361 + 356076900 = 25769^2 + 18870^2 .

It is an emirp because it is prime and its reverse (1628110201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020118261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020118061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510059130 + 510059131.

It is an arithmetic number, because the mean of its divisors is an integer number (510059131).

Almost surely, 2^1020118261 is an apocalyptic number.

It is an amenable number.

1020118261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020118261 is an equidigital number, since it uses as much as digits as its factorization.

1020118261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 1020118261 is about 31939.2902394527. The cubic root of 1020118261 is about 1006.6616113927.

Adding to 1020118261 its reverse (1628110201), we get a palindrome (2648228462).

The spelling of 1020118261 in words is "one billion, twenty million, one hundred eighteen thousand, two hundred sixty-one".