1261655 has 8 divisors (see below), whose sum is σ = 1603152. Its totient is φ = 949888.

The previous prime is 1261649. The next prime is 1261697. The reversal of 1261655 is 5561621.

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

It is a cyclic number.

It is not a de Polignac number, because 1261655 - 2⁴ = 1261639 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 7 ways as a sum of consecutive naturals, for example, 7337 + ... + 7506.

It is an arithmetic number, because the mean of its divisors is an integer number (200394).

2^1261655 is an apocalyptic number.

1261655 is a deficient number, since it is larger than the sum of its proper divisors (341497).

1261655 is a wasteful number, since it uses less digits than its factorization.

1261655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14865.

The product of its digits is 1800, while the sum is 26.

The square root of 1261655 is about 1123.2341697082. The cubic root of 1261655 is about 108.0554984535.

The spelling of 1261655 in words is "one million, two hundred sixty-one thousand, six hundred fifty-five".