1061581855 has 8 divisors (see below), whose sum is σ = 1290024000. Its totient is φ = 838514976.

The previous prime is 1061581823. The next prime is 1061581861. The reversal of 1061581855 is 5581851601.

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 1061581855 - 2⁵ = 1061581823 is a prime.

It is a super-2 number, since 2×1061581855² = 2253912069730482050, which contains 22 as substring.

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, 1343380 + ... + 1344169.

It is an arithmetic number, because the mean of its divisors is an integer number (161253000).

Almost surely, 2^1061581855 is an apocalyptic number.

1061581855 is a deficient number, since it is larger than the sum of its proper divisors (228442145).

1061581855 is an equidigital number, since it uses as much as digits as its factorization.

1061581855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2687633.

The product of its (nonzero) digits is 48000, while the sum is 40.

The square root of 1061581855 is about 32581.9252807442. The cubic root of 1061581855 is about 1020.1197651886.

The spelling of 1061581855 in words is "one billion, sixty-one million, five hundred eighty-one thousand, eight hundred fifty-five".