1865340251 has 2 divisors, whose sum is σ = 1865340252. Its totient is φ = 1865340250.

The previous prime is 1865340193. The next prime is 1865340259. The reversal of 1865340251 is 1520435681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1865340251 - 2¹⁰ = 1865339227 is a prime.

It is not a weakly prime, because it can be changed into another prime (1865340259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 932670125 + 932670126.

It is an arithmetic number, because the mean of its divisors is an integer number (932670126).

Almost surely, 2^1865340251 is an apocalyptic number.

1865340251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1865340251 is an equidigital number, since it uses as much as digits as its factorization.

1865340251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 1865340251 is about 43189.5849829562. The cubic root of 1865340251 is about 1230.9847911149.

The spelling of 1865340251 in words is "one billion, eight hundred sixty-five million, three hundred forty thousand, two hundred fifty-one".