671251249 has 4 divisors (see below), whose sum is σ = 672035364. Its totient is φ = 670467136.

The previous prime is 671251223. The next prime is 671251271. The reversal of 671251249 is 942152176.

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

It can be written as a sum of positive squares in 2 ways, for example, as 359481600 + 311769649 = 18960^2 + 17657^2 .

It is a cyclic number.

It is not a de Polignac number, because 671251249 - 2¹⁵ = 671218481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671251949) 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, 390772 + ... + 392485.

It is an arithmetic number, because the mean of its divisors is an integer number (168008841).

Almost surely, 2^671251249 is an apocalyptic number.

It is an amenable number.

671251249 is a deficient number, since it is larger than the sum of its proper divisors (784115).

671251249 is an equidigital number, since it uses as much as digits as its factorization.

671251249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 784114.

The product of its digits is 30240, while the sum is 37.

The square root of 671251249 is about 25908.5169201172. The cubic root of 671251249 is about 875.5783926614.

The spelling of 671251249 in words is "six hundred seventy-one million, two hundred fifty-one thousand, two hundred forty-nine".