1155657361 has 2 divisors, whose sum is σ = 1155657362. Its totient is φ = 1155657360.

The previous prime is 1155657359. The next prime is 1155657407. The reversal of 1155657361 is 1637565511.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1068047761 + 87609600 = 32681^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155657361 - 2¹ = 1155657359 is a prime.

Together with 1155657359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1155657301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577828680 + 577828681.

It is an arithmetic number, because the mean of its divisors is an integer number (577828681).

Almost surely, 2^1155657361 is an apocalyptic number.

It is an amenable number.

1155657361 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155657361 is an equidigital number, since it uses as much as digits as its factorization.

1155657361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94500, while the sum is 40.

The square root of 1155657361 is about 33994.9608177447. The cubic root of 1155657361 is about 1049.4047604335.

The spelling of 1155657361 in words is "one billion, one hundred fifty-five million, six hundred fifty-seven thousand, three hundred sixty-one".