671540111 has 8 divisors (see below), whose sum is σ = 733708800. Its totient is φ = 609558040.

The previous prime is 671540041. The next prime is 671540113. The reversal of 671540111 is 111045176.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 671540111 - 2¹⁸ = 671277967 is a prime.

It is a super-2 number, since 2×671540111² = 901932241363784642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671540113) 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, 39071 + ... + 53568.

It is an arithmetic number, because the mean of its divisors is an integer number (91713600).

Almost surely, 2^671540111 is an apocalyptic number.

671540111 is a deficient number, since it is larger than the sum of its proper divisors (62168689).

671540111 is a wasteful number, since it uses less digits than its factorization.

671540111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93309.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 671540111 is about 25914.0909738312. The cubic root of 671540111 is about 875.7039715980.

Adding to 671540111 its reverse (111045176), we get a palindrome (782585287).

The spelling of 671540111 in words is "six hundred seventy-one million, five hundred forty thousand, one hundred eleven".