671800049 has 2 divisors, whose sum is σ = 671800050. Its totient is φ = 671800048.

The previous prime is 671800037. The next prime is 671800097. The reversal of 671800049 is 940008176.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 595360000 + 76440049 = 24400^2 + 8743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-671800049 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 671799991 and 671800018.

It is not a weakly prime, because it can be changed into another prime (671802049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335900024 + 335900025.

It is an arithmetic number, because the mean of its divisors is an integer number (335900025).

Almost surely, 2^671800049 is an apocalyptic number.

It is an amenable number.

671800049 is a deficient number, since it is larger than the sum of its proper divisors (1).

671800049 is an equidigital number, since it uses as much as digits as its factorization.

671800049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 671800049 is about 25919.1058680657. The cubic root of 671800049 is about 875.8169454281.

The spelling of 671800049 in words is "six hundred seventy-one million, eight hundred thousand, forty-nine".