1261738525 has 24 divisors (see below), whose sum is σ = 1620967680. Its totient is φ = 973103040.

The previous prime is 1261738519. The next prime is 1261738537. The reversal of 1261738525 is 5258371621.

It is not a de Polignac number, because 1261738525 - 2¹³ = 1261730333 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 885964 + ... + 887386.

It is an arithmetic number, because the mean of its divisors is an integer number (67540320).

Almost surely, 2^1261738525 is an apocalyptic number.

It is an amenable number.

1261738525 is a deficient number, since it is larger than the sum of its proper divisors (359229155).

1261738525 is a wasteful number, since it uses less digits than its factorization.

1261738525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2685 (or 2680 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 1261738525 is about 35520.9589538346. The cubic root of 1261738525 is about 1080.5788292369.

The spelling of 1261738525 in words is "one billion, two hundred sixty-one million, seven hundred thirty-eight thousand, five hundred twenty-five".