1061581655 has 4 divisors (see below), whose sum is σ = 1273897992. Its totient is φ = 849265320.

The previous prime is 1061581637. The next prime is 1061581669. The reversal of 1061581655 is 5561851601.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-1061581655 is a prime.

It is a super-2 number, since 2×1061581655² = 2253911220465078050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 106158161 + ... + 106158170.

It is an arithmetic number, because the mean of its divisors is an integer number (318474498).

Almost surely, 2^1061581655 is an apocalyptic number.

1061581655 is a deficient number, since it is larger than the sum of its proper divisors (212316337).

1061581655 is an equidigital number, since it uses as much as digits as its factorization.

1061581655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212316336.

The product of its (nonzero) digits is 36000, while the sum is 38.

The square root of 1061581655 is about 32581.9222115577. The cubic root of 1061581655 is about 1020.1197011257.

The spelling of 1061581655 in words is "one billion, sixty-one million, five hundred eighty-one thousand, six hundred fifty-five".