671919551 has 4 divisors (see below), whose sum is σ = 672434952. Its totient is φ = 671404152.

The previous prime is 671919527. The next prime is 671919557. The reversal of 671919551 is 155919176.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671919551 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 (671919557) 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, 255740 + ... + 258353.

It is an arithmetic number, because the mean of its divisors is an integer number (168108738).

Almost surely, 2^671919551 is an apocalyptic number.

671919551 is a deficient number, since it is larger than the sum of its proper divisors (515401).

671919551 is a wasteful number, since it uses less digits than its factorization.

671919551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515400.

The product of its digits is 85050, while the sum is 44.

The square root of 671919551 is about 25921.4110534130. The cubic root of 671919551 is about 875.8688734145.

The spelling of 671919551 in words is "six hundred seventy-one million, nine hundred nineteen thousand, five hundred fifty-one".