1161505513 has 4 divisors (see below), whose sum is σ = 1327434880. Its totient is φ = 995576148.

The previous prime is 1161505493. The next prime is 1161505519. The reversal of 1161505513 is 3155051611.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1161505513 - 2⁹ = 1161505001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1161505519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82964673 + ... + 82964686.

It is an arithmetic number, because the mean of its divisors is an integer number (331858720).

Almost surely, 2^1161505513 is an apocalyptic number.

It is an amenable number.

1161505513 is a deficient number, since it is larger than the sum of its proper divisors (165929367).

1161505513 is an equidigital number, since it uses as much as digits as its factorization.

1161505513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165929366.

The product of its (nonzero) digits is 2250, while the sum is 28.

The square root of 1161505513 is about 34080.8672571576. The cubic root of 1161505513 is about 1051.1719380373.

The spelling of 1161505513 in words is "one billion, one hundred sixty-one million, five hundred five thousand, five hundred thirteen".