1131725065 has 4 divisors (see below), whose sum is σ = 1358070084. Its totient is φ = 905380048.

The previous prime is 1131725053. The next prime is 1131725069. The reversal of 1131725065 is 5605271311.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 388562944 + 743162121 = 19712^2 + 27261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131725065 - 2⁵ = 1131725033 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131725069) 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, 113172502 + ... + 113172511.

It is an arithmetic number, because the mean of its divisors is an integer number (339517521).

Almost surely, 2^1131725065 is an apocalyptic number.

It is an amenable number.

1131725065 is a deficient number, since it is larger than the sum of its proper divisors (226345019).

1131725065 is an equidigital number, since it uses as much as digits as its factorization.

1131725065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226345018.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1131725065 is about 33641.1216370679. The cubic root of 1131725065 is about 1042.1101955365.

Adding to 1131725065 its reverse (5605271311), we get a palindrome (6736996376).

The spelling of 1131725065 in words is "one billion, one hundred thirty-one million, seven hundred twenty-five thousand, sixty-five".