1265251250 has 20 divisors (see below), whose sum is σ = 2371589286. Its totient is φ = 506100000.

The previous prime is 1265251241. The next prime is 1265251259. The reversal of 1265251250 is 521525621.

It is an interprime number because it is at equal distance from previous prime (1265251241) and next prime (1265251259).

It can be written as a sum of positive squares in 5 ways, for example, as 48846121 + 1216405129 = 6989^2 + 34877^2 .

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (1265251259) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 504851 + ... + 507350.

Almost surely, 2^1265251250 is an apocalyptic number.

1265251250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265251250 is a deficient number, since it is larger than the sum of its proper divisors (1106338036).

1265251250 is an equidigital number, since it uses as much as digits as its factorization.

1265251250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012223 (or 1012208 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 1265251250 is about 35570.3703944730. The cubic root of 1265251250 is about 1081.5806900571.

Adding to 1265251250 its reverse (521525621), we get a palindrome (1786776871).

The spelling of 1265251250 in words is "one billion, two hundred sixty-five million, two hundred fifty-one thousand, two hundred fifty".