671355531 has 48 divisors (see below), whose sum is σ = 1216470528. Its totient is φ = 346608000.

The previous prime is 671355497. The next prime is 671355547. The reversal of 671355531 is 135553176.

671355531 is a `hidden beast` number, since 6 + 71 + 3 + 55 + 531 = 666.

It is not a de Polignac number, because 671355531 - 2⁹ = 671355019 is a prime.

It is a super-2 number, since 2×671355531² = 901436498008583922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671355571) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 112831 + ... + 118631.

It is an arithmetic number, because the mean of its divisors is an integer number (25343136).

Almost surely, 2^671355531 is an apocalyptic number.

671355531 is a deficient number, since it is larger than the sum of its proper divisors (545114997).

671355531 is a wasteful number, since it uses less digits than its factorization.

671355531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5992 (or 5989 counting only the distinct ones).

The product of its digits is 47250, while the sum is 36.

The square root of 671355531 is about 25910.5293461944. The cubic root of 671355531 is about 875.6237320372.

The spelling of 671355531 in words is "six hundred seventy-one million, three hundred fifty-five thousand, five hundred thirty-one".