1140215561 has 2 divisors, whose sum is σ = 1140215562. Its totient is φ = 1140215560.

The previous prime is 1140215521. The next prime is 1140215567. The reversal of 1140215561 is 1655120411.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1125199936 + 15015625 = 33544^2 + 3875^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1140215561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1140215561.

It is not a weakly prime, because it can be changed into another prime (1140215567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 570107780 + 570107781.

It is an arithmetic number, because the mean of its divisors is an integer number (570107781).

Almost surely, 2^1140215561 is an apocalyptic number.

It is an amenable number.

1140215561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1140215561 is an equidigital number, since it uses as much as digits as its factorization.

1140215561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 1140215561 is about 33767.0780642921. The cubic root of 1140215561 is about 1044.7097660907.

Adding to 1140215561 its reverse (1655120411), we get a palindrome (2795335972).

The spelling of 1140215561 in words is "one billion, one hundred forty million, two hundred fifteen thousand, five hundred sixty-one".