671845949 has 4 divisors (see below), whose sum is σ = 681308640. Its totient is φ = 662383260.

The previous prime is 671845943. The next prime is 671845957. The reversal of 671845949 is 949548176.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 671845949 - 2¹⁶ = 671780413 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 671845949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671845943) 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, 4731239 + ... + 4731380.

It is an arithmetic number, because the mean of its divisors is an integer number (170327160).

Almost surely, 2^671845949 is an apocalyptic number.

It is an amenable number.

671845949 is a deficient number, since it is larger than the sum of its proper divisors (9462691).

671845949 is an equidigital number, since it uses as much as digits as its factorization.

671845949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9462690.

The product of its digits is 2177280, while the sum is 53.

The square root of 671845949 is about 25919.9913001529. The cubic root of 671845949 is about 875.8368913839.

The spelling of 671845949 in words is "six hundred seventy-one million, eight hundred forty-five thousand, nine hundred forty-nine".