1191763553 has 2 divisors, whose sum is σ = 1191763554. Its totient is φ = 1191763552.

The previous prime is 1191763541. The next prime is 1191763567. The reversal of 1191763553 is 3553671911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151719969 + 40043584 = 33937^2 + 6328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191763553 - 2⁸ = 1191763297 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1191763553.

It is not a weakly prime, because it can be changed into another prime (1191762553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595881776 + 595881777.

It is an arithmetic number, because the mean of its divisors is an integer number (595881777).

Almost surely, 2^1191763553 is an apocalyptic number.

It is an amenable number.

1191763553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191763553 is an equidigital number, since it uses as much as digits as its factorization.

1191763553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85050, while the sum is 41.

The square root of 1191763553 is about 34521.9285817001. The cubic root of 1191763553 is about 1060.2217267864.

The spelling of 1191763553 in words is "one billion, one hundred ninety-one million, seven hundred sixty-three thousand, five hundred fifty-three".