671621043 has 4 divisors (see below), whose sum is σ = 895494728. Its totient is φ = 447747360.

The previous prime is 671621017. The next prime is 671621051. The reversal of 671621043 is 340126176.

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

It is not a de Polignac number, because 671621043 - 2⁵ = 671621011 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 671621043.

It is not an unprimeable number, because it can be changed into a prime (671621053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111936838 + ... + 111936843.

It is an arithmetic number, because the mean of its divisors is an integer number (223873682).

Almost surely, 2^671621043 is an apocalyptic number.

671621043 is a deficient number, since it is larger than the sum of its proper divisors (223873685).

671621043 is a wasteful number, since it uses less digits than its factorization.

671621043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223873684.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 671621043 is about 25915.6524710454. The cubic root of 671621043 is about 875.7391492569.

The spelling of 671621043 in words is "six hundred seventy-one million, six hundred twenty-one thousand, forty-three".