1261324825 has 12 divisors (see below), whose sum is σ = 1565307180. Its totient is φ = 1008244160.

The previous prime is 1261324817. The next prime is 1261324837. The reversal of 1261324825 is 5284231621.

It can be written as a sum of positive squares in 6 ways, for example, as 56957209 + 1204367616 = 7547^2 + 34704^2 .

It is not a de Polignac number, because 1261324825 - 2³ = 1261324817 is a prime.

It is a super-2 number, since 2×1261324825² = 3181880628322561250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12171 + ... + 51679.

It is an arithmetic number, because the mean of its divisors is an integer number (130442265).

Almost surely, 2^1261324825 is an apocalyptic number.

It is an amenable number.

1261324825 is a deficient number, since it is larger than the sum of its proper divisors (303982355).

1261324825 is a wasteful number, since it uses less digits than its factorization.

1261324825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40796 (or 40791 counting only the distinct ones).

The product of its digits is 23040, while the sum is 34.

The square root of 1261324825 is about 35515.1351539030. The cubic root of 1261324825 is about 1080.4607159301.

The spelling of 1261324825 in words is "one billion, two hundred sixty-one million, three hundred twenty-four thousand, eight hundred twenty-five".