1087271681 has 4 divisors (see below), whose sum is σ = 1089156612. Its totient is φ = 1085386752.

The previous prime is 1087271659. The next prime is 1087271687. The reversal of 1087271681 is 1861727801.

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

It can be written as a sum of positive squares in 2 ways, for example, as 517972081 + 569299600 = 22759^2 + 23860^2 .

It is a cyclic number.

It is not a de Polignac number, because 1087271681 - 2²⁶ = 1020162817 is a prime.

It is a super-2 number, since 2×1087271681² = 2364319416609131522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1087271687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941600 + ... + 942753.

It is an arithmetic number, because the mean of its divisors is an integer number (272289153).

Almost surely, 2^1087271681 is an apocalyptic number.

It is an amenable number.

1087271681 is a deficient number, since it is larger than the sum of its proper divisors (1884931).

1087271681 is an equidigital number, since it uses as much as digits as its factorization.

1087271681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884930.

The product of its (nonzero) digits is 37632, while the sum is 41.

The square root of 1087271681 is about 32973.8029502210. The cubic root of 1087271681 is about 1028.2830858633.

The spelling of 1087271681 in words is "one billion, eighty-seven million, two hundred seventy-one thousand, six hundred eighty-one".