1086172561 has 4 divisors (see below), whose sum is σ = 1111432432. Its totient is φ = 1060912692.

The previous prime is 1086172559. The next prime is 1086172589. The reversal of 1086172561 is 1652716801.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1086172561 - 2¹ = 1086172559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1086172561.

It is not an unprimeable number, because it can be changed into a prime (1086172511) 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, 12629871 + ... + 12629956.

It is an arithmetic number, because the mean of its divisors is an integer number (277858108).

Almost surely, 2^1086172561 is an apocalyptic number.

It is an amenable number.

1086172561 is a deficient number, since it is larger than the sum of its proper divisors (25259871).

1086172561 is an equidigital number, since it uses as much as digits as its factorization.

1086172561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25259870.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1086172561 is about 32957.1321719594. The cubic root of 1086172561 is about 1027.9364728441.

The spelling of 1086172561 in words is "one billion, eighty-six million, one hundred seventy-two thousand, five hundred sixty-one".