1135948981 has 2 divisors, whose sum is σ = 1135948982. Its totient is φ = 1135948980.

The previous prime is 1135948973. The next prime is 1135948997. The reversal of 1135948981 is 1898495311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106626756 + 29322225 = 33266^2 + 5415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1135948981 - 2³ = 1135948973 is a prime.

It is a super-2 number, since 2×1135948981² = 2580760174869876722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1135942981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 567974490 + 567974491.

It is an arithmetic number, because the mean of its divisors is an integer number (567974491).

Almost surely, 2^1135948981 is an apocalyptic number.

It is an amenable number.

1135948981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1135948981 is an equidigital number, since it uses as much as digits as its factorization.

1135948981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 49.

The square root of 1135948981 is about 33703.8422290397. The cubic root of 1135948981 is about 1043.4050686340.

The spelling of 1135948981 in words is "one billion, one hundred thirty-five million, nine hundred forty-eight thousand, nine hundred eighty-one".