1261947025 has 12 divisors (see below), whose sum is σ = 1580310684. Its totient is φ = 999560000.

The previous prime is 1261946993. The next prime is 1261947031. The reversal of 1261947025 is 5207491621.

It can be written as a sum of positive squares in 6 ways, for example, as 31270464 + 1230676561 = 5592^2 + 35081^2 .

It is not a de Polignac number, because 1261947025 - 2⁵ = 1261946993 is a prime.

It is a Duffinian number.

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, 247366 + ... + 252415.

It is an arithmetic number, because the mean of its divisors is an integer number (131692557).

Almost surely, 2^1261947025 is an apocalyptic number.

It is an amenable number.

1261947025 is a deficient number, since it is larger than the sum of its proper divisors (318363659).

1261947025 is a wasteful number, since it uses less digits than its factorization.

1261947025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499892 (or 499887 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 1261947025 is about 35523.8937195798. The cubic root of 1261947025 is about 1080.6383471884.

The spelling of 1261947025 in words is "one billion, two hundred sixty-one million, nine hundred forty-seven thousand, twenty-five".