1555481081 has 8 divisors (see below), whose sum is σ = 1939301184. Its totient is φ = 1212063120.

The previous prime is 1555481077. The next prime is 1555481087. The reversal of 1555481081 is 1801845551.

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

It is a cyclic number.

It is not a de Polignac number, because 1555481081 - 2² = 1555481077 is a prime.

It is a super-2 number, since 2×1555481081² = 4839042786697857122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1555481087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10100450 + ... + 10100603.

It is an arithmetic number, because the mean of its divisors is an integer number (242412648).

Almost surely, 2^1555481081 is an apocalyptic number.

1555481081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1555481081 is a deficient number, since it is larger than the sum of its proper divisors (383820103).

1555481081 is a wasteful number, since it uses less digits than its factorization.

1555481081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20201071.

The product of its (nonzero) digits is 32000, while the sum is 38.

The square root of 1555481081 is about 39439.5877387176. The cubic root of 1555481081 is about 1158.6570568904.

The spelling of 1555481081 in words is "one billion, five hundred fifty-five million, four hundred eighty-one thousand, eighty-one".