1818030961 has 2 divisors, whose sum is σ = 1818030962. Its totient is φ = 1818030960.

The previous prime is 1818030953. The next prime is 1818031003. The reversal of 1818030961 is 1690308181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1804635361 + 13395600 = 42481^2 + 3660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1818030961 - 2³ = 1818030953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1818030961.

It is not a weakly prime, because it can be changed into another prime (1818030161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 909015480 + 909015481.

It is an arithmetic number, because the mean of its divisors is an integer number (909015481).

Almost surely, 2^1818030961 is an apocalyptic number.

It is an amenable number.

1818030961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1818030961 is an equidigital number, since it uses as much as digits as its factorization.

1818030961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 1818030961 is about 42638.3742771696. The cubic root of 1818030961 is about 1220.4886873643.

It can be divided in two parts, 18180 and 30961, that added together give a triangular number (49141 = T₃₁₃).

The spelling of 1818030961 in words is "one billion, eight hundred eighteen million, thirty thousand, nine hundred sixty-one".