671081407 has 4 divisors (see below), whose sum is σ = 671687640. Its totient is φ = 670475176.

The previous prime is 671081401. The next prime is 671081417. The reversal of 671081407 is 704180176.

671081407 = T₄₉₈ + T₄₉₉ + ... + T₁₆₀₆.

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

It is a cyclic number.

It is not a de Polignac number, because 671081407 - 2¹⁵ = 671048639 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 (671081401) 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, 301453 + ... + 303670.

It is an arithmetic number, because the mean of its divisors is an integer number (167921910).

Almost surely, 2^671081407 is an apocalyptic number.

671081407 is a deficient number, since it is larger than the sum of its proper divisors (606233).

671081407 is a wasteful number, since it uses less digits than its factorization.

671081407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606232.

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 671081407 is about 25905.2389875098. The cubic root of 671081407 is about 875.5045392770.

The spelling of 671081407 in words is "six hundred seventy-one million, eighty-one thousand, four hundred seven".