671414981 has 2 divisors, whose sum is σ = 671414982. Its totient is φ = 671414980.

The previous prime is 671414977. The next prime is 671414993. The reversal of 671414981 is 189414176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 524181025 + 147233956 = 22895^2 + 12134^2 .

It is a cyclic number.

It is not a de Polignac number, because 671414981 - 2² = 671414977 is a prime.

It is a super-2 number, since 2×671414981² = 901596153422460722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (671414911) 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 as a sum of consecutive naturals, namely, 335707490 + 335707491.

It is an arithmetic number, because the mean of its divisors is an integer number (335707491).

Almost surely, 2^671414981 is an apocalyptic number.

It is an amenable number.

671414981 is a deficient number, since it is larger than the sum of its proper divisors (1).

671414981 is an equidigital number, since it uses as much as digits as its factorization.

671414981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 671414981 is about 25911.6765378082. The cubic root of 671414981 is about 875.6495774063.

The spelling of 671414981 in words is "six hundred seventy-one million, four hundred fourteen thousand, nine hundred eighty-one".