1161087861 has 8 divisors (see below), whose sum is σ = 1589958304. Its totient is φ = 753138000.

The previous prime is 1161087803. The next prime is 1161087869. The reversal of 1161087861 is 1687801611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1161087861 - 2⁶ = 1161087797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161087869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5230015 + ... + 5230236.

It is an arithmetic number, because the mean of its divisors is an integer number (198744788).

Almost surely, 2^1161087861 is an apocalyptic number.

It is an amenable number.

1161087861 is a deficient number, since it is larger than the sum of its proper divisors (428870443).

1161087861 is a wasteful number, since it uses less digits than its factorization.

1161087861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10460291.

The product of its (nonzero) digits is 16128, while the sum is 39.

The square root of 1161087861 is about 34074.7393386949. The cubic root of 1161087861 is about 1051.0459301137.

The spelling of 1161087861 in words is "one billion, one hundred sixty-one million, eighty-seven thousand, eight hundred sixty-one".