1261964425 has 6 divisors (see below), whose sum is σ = 1564835918. Its totient is φ = 1009571520.

The previous prime is 1261964413. The next prime is 1261964449. The reversal of 1261964425 is 5244691621.

It can be written as a sum of positive squares in 3 ways, for example, as 35844169 + 1226120256 = 5987^2 + 35016^2 .

It is not a de Polignac number, because 1261964425 - 2¹³ = 1261956233 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25239264 + ... + 25239313.

Almost surely, 2^1261964425 is an apocalyptic number.

It is an amenable number.

1261964425 is a deficient number, since it is larger than the sum of its proper divisors (302871493).

1261964425 is an equidigital number, since it uses as much as digits as its factorization.

1261964425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50478587 (or 50478582 counting only the distinct ones).

The product of its digits is 103680, while the sum is 40.

The square root of 1261964425 is about 35524.1386243214. The cubic root of 1261964425 is about 1080.6433138577.

The spelling of 1261964425 in words is "one billion, two hundred sixty-one million, nine hundred sixty-four thousand, four hundred twenty-five".