1201655 has 32 divisors (see below), whose sum is σ = 1881600. Its totient is φ = 715392.

The previous prime is 1201643. The next prime is 1201687. The reversal of 1201655 is 5561021.

1201655 is nontrivially palindromic in base 9.

It is a cyclic number.

It is not a de Polignac number, because 1201655 - 2¹⁸ = 939511 is a prime.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8576 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (58800).

2^1201655 is an apocalyptic number.

1201655 is a deficient number, since it is larger than the sum of its proper divisors (679945).

1201655 is a wasteful number, since it uses less digits than its factorization.

1201655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 1201655 is about 1096.2002554278. The cubic root of 1201655 is about 106.3146872526.

Adding to 1201655 its reverse (5561021), we get a palindrome (6762676).

The spelling of 1201655 in words is "one million, two hundred one thousand, six hundred fifty-five".