1261682385 has 16 divisors (see below), whose sum is σ = 2020303296. Its totient is φ = 672360128.

The previous prime is 1261682371. The next prime is 1261682399. The reversal of 1261682385 is 5832861621.

It is an interprime number because it is at equal distance from previous prime (1261682371) and next prime (1261682399).

It is a cyclic number.

It is not a de Polignac number, because 1261682385 - 2¹² = 1261678289 is a prime.

It is a super-3 number, since 3×1261682385³ (a number of 28 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13779 + ... + 52088.

It is an arithmetic number, because the mean of its divisors is an integer number (126268956).

Almost surely, 2^1261682385 is an apocalyptic number.

1261682385 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1261682385 is a deficient number, since it is larger than the sum of its proper divisors (758620911).

1261682385 is a wasteful number, since it uses less digits than its factorization.

1261682385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67152.

The product of its digits is 138240, while the sum is 42.

The square root of 1261682385 is about 35520.1687073696. The cubic root of 1261682385 is about 1080.5628025156.

The spelling of 1261682385 in words is "one billion, two hundred sixty-one million, six hundred eighty-two thousand, three hundred eighty-five".