671509501 has 6 divisors (see below), whose sum is σ = 727137690. Its totient is φ = 619854768.

The previous prime is 671509493. The next prime is 671509513. The reversal of 671509501 is 105905176.

It can be written as a sum of positive squares in 3 ways, for example, as 12355225 + 659154276 = 3515^2 + 25674^2 .

It is not a de Polignac number, because 671509501 - 2³ = 671509493 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 (671509561) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1986546 + ... + 1986883.

It is an arithmetic number, because the mean of its divisors is an integer number (121189615).

Almost surely, 2^671509501 is an apocalyptic number.

It is an amenable number.

671509501 is a deficient number, since it is larger than the sum of its proper divisors (55628189).

671509501 is a wasteful number, since it uses less digits than its factorization.

671509501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973455 (or 3973442 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 671509501 is about 25913.5003617805. The cubic root of 671509501 is about 875.6906660111.

The spelling of 671509501 in words is "six hundred seventy-one million, five hundred nine thousand, five hundred one".