1261610685 has 24 divisors (see below), whose sum is σ = 2199899520. Its totient is φ = 668825952.

The previous prime is 1261610683. The next prime is 1261610711. The reversal of 1261610685 is 5860161621.

It is not a de Polignac number, because 1261610685 - 2¹ = 1261610683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261610683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76425 + ... + 91454.

It is an arithmetic number, because the mean of its divisors is an integer number (91662480).

Almost surely, 2^1261610685 is an apocalyptic number.

1261610685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261610685 is a deficient number, since it is larger than the sum of its proper divisors (938288835).

1261610685 is a wasteful number, since it uses less digits than its factorization.

1261610685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168057 (or 168054 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1261610685 is about 35519.1594072833. The cubic root of 1261610685 is about 1080.5423330690.

The spelling of 1261610685 in words is "one billion, two hundred sixty-one million, six hundred ten thousand, six hundred eighty-five".