1261492525 has 12 divisors (see below), whose sum is σ = 1579741524. Its totient is φ = 999200000.

The previous prime is 1261492513. The next prime is 1261492567. The reversal of 1261492525 is 5252941621.

It can be written as a sum of positive squares in 6 ways, for example, as 23367556 + 1238124969 = 4834^2 + 35187^2 .

It is not a de Polignac number, because 1261492525 - 2⁵ = 1261492493 is a prime.

It is a Duffinian number.

It is a congruent 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, 247276 + ... + 252325.

It is an arithmetic number, because the mean of its divisors is an integer number (131645127).

Almost surely, 2^1261492525 is an apocalyptic number.

It is an amenable number.

1261492525 is a deficient number, since it is larger than the sum of its proper divisors (318248999).

1261492525 is a wasteful number, since it uses less digits than its factorization.

1261492525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499712 (or 499707 counting only the distinct ones).

The product of its digits is 43200, while the sum is 37.

The square root of 1261492525 is about 35517.4960406839. The cubic root of 1261492525 is about 1080.5085981855.

The spelling of 1261492525 in words is "one billion, two hundred sixty-one million, four hundred ninety-two thousand, five hundred twenty-five".