1555881641 has 8 divisors (see below), whose sum is σ = 1571893440. Its totient is φ = 1539887472.

The previous prime is 1555881637. The next prime is 1555881643. The reversal of 1555881641 is 1461885551.

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 1555881641 - 2² = 1555881637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1555881592 and 1555881601.

It is not an unprimeable number, because it can be changed into a prime (1555881643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242906 + ... + 249228.

It is an arithmetic number, because the mean of its divisors is an integer number (196486680).

Almost surely, 2^1555881641 is an apocalyptic number.

It is an amenable number.

1555881641 is a deficient number, since it is larger than the sum of its proper divisors (16011799).

1555881641 is a wasteful number, since it uses less digits than its factorization.

1555881641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8815.

The product of its digits is 192000, while the sum is 44.

The square root of 1555881641 is about 39444.6655582222. The cubic root of 1555881641 is about 1158.7565056169.

The spelling of 1555881641 in words is "one billion, five hundred fifty-five million, eight hundred eighty-one thousand, six hundred forty-one".