1861319959 has 2 divisors, whose sum is σ = 1861319960. Its totient is φ = 1861319958.

The previous prime is 1861319951. The next prime is 1861319969. The reversal of 1861319959 is 9599131681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1861319959 - 2³ = 1861319951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1861319951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 930659979 + 930659980.

It is an arithmetic number, because the mean of its divisors is an integer number (930659980).

Almost surely, 2^1861319959 is an apocalyptic number.

1861319959 is a deficient number, since it is larger than the sum of its proper divisors (1).

1861319959 is an equidigital number, since it uses as much as digits as its factorization.

1861319959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 52.

The square root of 1861319959 is about 43143.0174999385. The cubic root of 1861319959 is about 1230.0997911854.

The spelling of 1861319959 in words is "one billion, eight hundred sixty-one million, three hundred nineteen thousand, nine hundred fifty-nine".