671245731 has 128 divisors (see below), whose sum is σ = 1217341440. Its totient is φ = 361304064.

The previous prime is 671245721. The next prime is 671245733. The reversal of 671245731 is 137542176.

It is a happy number.

671245731 is a `hidden beast` number, since 67 + 1 + 24 + 573 + 1 = 666.

It is not a de Polignac number, because 671245731 - 2¹⁴ = 671229347 is a prime.

It is a super-2 number, since 2×671245731² = 901141662771448722, which contains 22 as substring.

Its product of digits (35280) is a multiple of the sum of its prime divisors (196).

It is not an unprimeable number, because it can be changed into a prime (671245733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9195111 + ... + 9195183.

It is an arithmetic number, because the mean of its divisors is an integer number (9510480).

Almost surely, 2^671245731 is an apocalyptic number.

671245731 is a deficient number, since it is larger than the sum of its proper divisors (546095709).

671245731 is a wasteful number, since it uses less digits than its factorization.

671245731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 196 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 671245731 is about 25908.4104298199. The cubic root of 671245731 is about 875.5759934331.

The spelling of 671245731 in words is "six hundred seventy-one million, two hundred forty-five thousand, seven hundred thirty-one".