1854731201381 has 2 divisors, whose sum is σ = 1854731201382. Its totient is φ = 1854731201380.

The previous prime is 1854731201263. The next prime is 1854731201383. The reversal of 1854731201381 is 1831021374581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1464063700225 + 390667501156 = 1209985^2 + 625034^2 .

It is a cyclic number.

It is not a de Polignac number, because 1854731201381 - 2³⁰ = 1853657459557 is a prime.

It is a super-2 number, since 2×1854731201381² (a number of 25 digits) contains 22 as substring.

Together with 1854731201383, 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 (1854731201383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 927365600690 + 927365600691.

It is an arithmetic number, because the mean of its divisors is an integer number (927365600691).

Almost surely, 2^{1854731201381} is an apocalyptic number.

It is an amenable number.

1854731201381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1854731201381 is an equidigital number, since it uses as much as digits as its factorization.

1854731201381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 44.

The spelling of 1854731201381 in words is "one trillion, eight hundred fifty-four billion, seven hundred thirty-one million, two hundred one thousand, three hundred eighty-one".