1086891001 has 12 divisors (see below), whose sum is σ = 1265470452. Its totient is φ = 930789888.

The previous prime is 1086890999. The next prime is 1086891023. The reversal of 1086891001 is 1001986801.

It can be written as a sum of positive squares in 2 ways, for example, as 595116025 + 491774976 = 24395^2 + 22176^2 .

It is not a de Polignac number, because 1086891001 - 2¹ = 1086890999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1086891101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49161 + ... + 67753.

It is an arithmetic number, because the mean of its divisors is an integer number (105455871).

Almost surely, 2^1086891001 is an apocalyptic number.

It is an amenable number.

1086891001 is a deficient number, since it is larger than the sum of its proper divisors (178579451).

1086891001 is a wasteful number, since it uses less digits than its factorization.

1086891001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19800 (or 19793 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 34.

The square root of 1086891001 is about 32968.0299836068. The cubic root of 1086891001 is about 1028.1630629638.

The spelling of 1086891001 in words is "one billion, eighty-six million, eight hundred ninety-one thousand, one".