1265231136 has 192 divisors, whose sum is σ = 3722181120. Its totient is φ = 373800960.

The previous prime is 1265231131. The next prime is 1265231197. The reversal of 1265231136 is 6311325621.

It is not an unprimeable number, because it can be changed into a prime (1265231131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4042116 + ... + 4042428.

It is an arithmetic number, because the mean of its divisors is an integer number (19386360).

Almost surely, 2^1265231136 is an apocalyptic number.

1265231136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265231136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1861090560).

1265231136 is an abundant number, since it is smaller than the sum of its proper divisors (2456949984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265231136 is a wasteful number, since it uses less digits than its factorization.

1265231136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 451 counting only the distinct ones).

The product of its digits is 6480, while the sum is 30.

The square root of 1265231136 is about 35570.0876580309. The cubic root of 1265231136 is about 1081.5749586449.

Adding to 1265231136 its reverse (6311325621), we get a palindrome (7576556757).

The spelling of 1265231136 in words is "one billion, two hundred sixty-five million, two hundred thirty-one thousand, one hundred thirty-six".