1265401250 has 20 divisors (see below), whose sum is σ = 2371870446. Its totient is φ = 506160000.

The previous prime is 1265401237. The next prime is 1265401279. The reversal of 1265401250 is 521045621.

It can be written as a sum of positive squares in 5 ways, for example, as 183846481 + 1081554769 = 13559^2 + 32887^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 504911 + ... + 507410.

Almost surely, 2^1265401250 is an apocalyptic number.

1265401250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1265401250 is a deficient number, since it is larger than the sum of its proper divisors (1106469196).

1265401250 is an equidigital number, since it uses as much as digits as its factorization.

1265401250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012343 (or 1012328 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1265401250 is about 35572.4788284426. The cubic root of 1265401250 is about 1081.6234301039.

Adding to 1265401250 its reverse (521045621), we get a palindrome (1786446871).

The spelling of 1265401250 in words is "one billion, two hundred sixty-five million, four hundred one thousand, two hundred fifty".