1865371061 has 2 divisors, whose sum is σ = 1865371062. Its totient is φ = 1865371060.

The previous prime is 1865371051. The next prime is 1865371063. The reversal of 1865371061 is 1601735681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1639440100 + 225930961 = 40490^2 + 15031^2 .

It is a cyclic number.

It is not a de Polignac number, because 1865371061 - 2¹⁴ = 1865354677 is a prime.

Together with 1865371063, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1865371063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932685530 + 932685531.

It is an arithmetic number, because the mean of its divisors is an integer number (932685531).

Almost surely, 2^1865371061 is an apocalyptic number.

It is an amenable number.

1865371061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865371061 is an equidigital number, since it uses as much as digits as its factorization.

1865371061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 1865371061 is about 43189.9416646978. The cubic root of 1865371061 is about 1230.9915685080.

The spelling of 1865371061 in words is "one billion, eight hundred sixty-five million, three hundred seventy-one thousand, sixty-one".