671061091 has 4 divisors (see below), whose sum is σ = 671129712. Its totient is φ = 670992472.

The previous prime is 671061049. The next prime is 671061121. The reversal of 671061091 is 190160176.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 671061091 - 2⁷ = 671060963 is a prime.

It is a super-2 number, since 2×671061091² = 900645975708220562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671061011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16591 + ... + 40216.

It is an arithmetic number, because the mean of its divisors is an integer number (167782428).

Almost surely, 2^671061091 is an apocalyptic number.

671061091 is a deficient number, since it is larger than the sum of its proper divisors (68621).

671061091 is a wasteful number, since it uses less digits than its factorization.

671061091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68620.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 671061091 is about 25904.8468630872. The cubic root of 671061091 is about 875.4957043182.

The spelling of 671061091 in words is "six hundred seventy-one million, sixty-one thousand, ninety-one".