1261682165 has 8 divisors (see below), whose sum is σ = 1518238080. Its totient is φ = 1006532752.

The previous prime is 1261682153. The next prime is 1261682167. The reversal of 1261682165 is 5612861621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1261682165 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261682167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349649 + ... + 353238.

It is an arithmetic number, because the mean of its divisors is an integer number (189779760).

Almost surely, 2^1261682165 is an apocalyptic number.

It is an amenable number.

1261682165 is a deficient number, since it is larger than the sum of its proper divisors (256555915).

1261682165 is an equidigital number, since it uses as much as digits as its factorization.

1261682165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703251.

The product of its digits is 34560, while the sum is 38.

The square root of 1261682165 is about 35520.1656105373. The cubic root of 1261682165 is about 1080.5627397095.

The spelling of 1261682165 in words is "one billion, two hundred sixty-one million, six hundred eighty-two thousand, one hundred sixty-five".