1856898013 has 2 divisors, whose sum is σ = 1856898014. Its totient is φ = 1856898012.

The previous prime is 1856897953. The next prime is 1856898023. The reversal of 1856898013 is 3108986581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1808205529 + 48692484 = 42523^2 + 6978^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1856898013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1856898023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 928449006 + 928449007.

It is an arithmetic number, because the mean of its divisors is an integer number (928449007).

Almost surely, 2^1856898013 is an apocalyptic number.

It is an amenable number.

1856898013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1856898013 is an equidigital number, since it uses as much as digits as its factorization.

1856898013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 1856898013 is about 43091.7394984236. The cubic root of 1856898013 is about 1229.1249009351.

The spelling of 1856898013 in words is "one billion, eight hundred fifty-six million, eight hundred ninety-eight thousand, thirteen".