1631206655 has 16 divisors (see below), whose sum is σ = 2110219104. Its totient is φ = 1203327360.

The previous prime is 1631206651. The next prime is 1631206663. The reversal of 1631206655 is 5566021361.

It is not a de Polignac number, because 1631206655 - 2² = 1631206651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631206651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52220 + ... + 77390.

It is an arithmetic number, because the mean of its divisors is an integer number (131888694).

Almost surely, 2^1631206655 is an apocalyptic number.

1631206655 is a deficient number, since it is larger than the sum of its proper divisors (479012449).

1631206655 is a wasteful number, since it uses less digits than its factorization.

1631206655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26186.

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1631206655 is about 40388.1994523153. The cubic root of 1631206655 is about 1177.1622548474.

The spelling of 1631206655 in words is "one billion, six hundred thirty-one million, two hundred six thousand, six hundred fifty-five".