1136601561 has 4 divisors (see below), whose sum is σ = 1515468752. Its totient is φ = 757734372.

The previous prime is 1136601559. The next prime is 1136601563. The reversal of 1136601561 is 1651066311.

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 an interprime number because it is at equal distance from previous prime (1136601559) and next prime (1136601563).

It is not a de Polignac number, because 1136601561 - 2¹ = 1136601559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1136601563) 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, 189433591 + ... + 189433596.

It is an arithmetic number, because the mean of its divisors is an integer number (378867188).

Almost surely, 2^1136601561 is an apocalyptic number.

It is an amenable number.

1136601561 is a deficient number, since it is larger than the sum of its proper divisors (378867191).

1136601561 is an equidigital number, since it uses as much as digits as its factorization.

1136601561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378867190.

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 1136601561 is about 33713.5219311184. The cubic root of 1136601561 is about 1043.6048355085.

Adding to 1136601561 its reverse (1651066311), we get a palindrome (2787667872).

The spelling of 1136601561 in words is "one billion, one hundred thirty-six million, six hundred one thousand, five hundred sixty-one".