1612180861 has 2 divisors, whose sum is σ = 1612180862. Its totient is φ = 1612180860.

The previous prime is 1612180813. The next prime is 1612180891. The reversal of 1612180861 is 1680812161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1435955236 + 176225625 = 37894^2 + 13275^2 .

It is a cyclic number.

It is not a de Polignac number, because 1612180861 - 2²⁷ = 1477963133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1612180891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 806090430 + 806090431.

It is an arithmetic number, because the mean of its divisors is an integer number (806090431).

Almost surely, 2^1612180861 is an apocalyptic number.

It is an amenable number.

1612180861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1612180861 is an equidigital number, since it uses as much as digits as its factorization.

1612180861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 34.

The square root of 1612180861 is about 40151.9720686295. The cubic root of 1612180861 is about 1172.5676827283.

The spelling of 1612180861 in words is "one billion, six hundred twelve million, one hundred eighty thousand, eight hundred sixty-one".