1855309481 has 8 divisors (see below), whose sum is σ = 1923990600. Its totient is φ = 1786942080.

The previous prime is 1855309453. The next prime is 1855309499. The reversal of 1855309481 is 1849035581.

It can be written as a sum of positive squares in 4 ways, for example, as 151683856 + 1703625625 = 12316^2 + 41275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1855309481 is a prime.

It is a super-2 number, since 2×1855309481² = 6884346540576978722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1855309441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66350 + ... + 90071.

It is an arithmetic number, because the mean of its divisors is an integer number (240498825).

Almost surely, 2^1855309481 is an apocalyptic number.

It is an amenable number.

1855309481 is a deficient number, since it is larger than the sum of its proper divisors (68681119).

1855309481 is a wasteful number, since it uses less digits than its factorization.

1855309481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156859.

The product of its (nonzero) digits is 172800, while the sum is 44.

The square root of 1855309481 is about 43073.3035765775. The cubic root of 1855309481 is about 1228.7743052532.

The spelling of 1855309481 in words is "one billion, eight hundred fifty-five million, three hundred nine thousand, four hundred eighty-one".