1164698561 has 4 divisors (see below), whose sum is σ = 1254290772. Its totient is φ = 1075106352.

The previous prime is 1164698539. The next prime is 1164698567. The reversal of 1164698561 is 1658964611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1658964611 = 163 ⋅10177697.

It can be written as a sum of positive squares in 2 ways, for example, as 143256961 + 1021441600 = 11969^2 + 31960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1164698561 - 2²⁶ = 1097589697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1164698567) 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, 44796086 + ... + 44796111.

It is an arithmetic number, because the mean of its divisors is an integer number (313572693).

Almost surely, 2^1164698561 is an apocalyptic number.

It is an amenable number.

1164698561 is a deficient number, since it is larger than the sum of its proper divisors (89592211).

1164698561 is an equidigital number, since it uses as much as digits as its factorization.

1164698561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89592210.

The product of its digits is 311040, while the sum is 47.

The square root of 1164698561 is about 34127.6802756941. The cubic root of 1164698561 is about 1052.1343015155.

The spelling of 1164698561 in words is "one billion, one hundred sixty-four million, six hundred ninety-eight thousand, five hundred sixty-one".