1265331145 has 8 divisors (see below), whose sum is σ = 1635197256. Its totient is φ = 934398336.

The previous prime is 1265331139. The next prime is 1265331157. The reversal of 1265331145 is 5411335621.

It can be written as a sum of positive squares in 4 ways, for example, as 32478601 + 1232852544 = 5699^2 + 35112^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1265331145 - 2¹³ = 1265322953 is a prime.

It is a super-2 number, since 2×1265331145² = 3202125813014022050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9733252 + ... + 9733381.

It is an arithmetic number, because the mean of its divisors is an integer number (204399657).

Almost surely, 2^1265331145 is an apocalyptic number.

It is an amenable number.

1265331145 is a deficient number, since it is larger than the sum of its proper divisors (369866111).

1265331145 is a wasteful number, since it uses less digits than its factorization.

1265331145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19466651.

The product of its digits is 10800, while the sum is 31.

The square root of 1265331145 is about 35571.4934322415. The cubic root of 1265331145 is about 1081.6034552511.

Adding to 1265331145 its reverse (5411335621), we get a palindrome (6676666766).

The spelling of 1265331145 in words is "one billion, two hundred sixty-five million, three hundred thirty-one thousand, one hundred forty-five".