1161505493 has 2 divisors, whose sum is σ = 1161505494. Its totient is φ = 1161505492.

The previous prime is 1161505487. The next prime is 1161505519. The reversal of 1161505493 is 3945051611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040901169 + 120604324 = 32263^2 + 10982^2 .

It is a cyclic number.

It is not a de Polignac number, because 1161505493 - 2²⁰ = 1160456917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1161505463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 580752746 + 580752747.

It is an arithmetic number, because the mean of its divisors is an integer number (580752747).

Almost surely, 2^1161505493 is an apocalyptic number.

It is an amenable number.

1161505493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1161505493 is an equidigital number, since it uses as much as digits as its factorization.

1161505493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 35.

The square root of 1161505493 is about 34080.8669637379. The cubic root of 1161505493 is about 1051.1719320039.

The spelling of 1161505493 in words is "one billion, one hundred sixty-one million, five hundred five thousand, four hundred ninety-three".