1555151540 has 48 divisors (see below), whose sum is σ = 3316073040. Its totient is φ = 612556800.

The previous prime is 1555151531. The next prime is 1555151569. The reversal of 1555151540 is 451515551.

It can be written as a sum of positive squares in 8 ways, for example, as 8145316 + 1547006224 = 2854^2 + 39332^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1555151497 and 1555151506.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 387866 + ... + 391854.

It is an arithmetic number, because the mean of its divisors is an integer number (69084855).

Almost surely, 2^1555151540 is an apocalyptic number.

1555151540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1555151540 is an abundant number, since it is smaller than the sum of its proper divisors (1760921500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1555151540 is a wasteful number, since it uses less digits than its factorization.

1555151540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292 (or 4290 counting only the distinct ones).

The product of its (nonzero) digits is 12500, while the sum is 32.

The square root of 1555151540 is about 39435.4097227352. The cubic root of 1555151540 is about 1158.5752275500.

The spelling of 1555151540 in words is "one billion, five hundred fifty-five million, one hundred fifty-one thousand, five hundred forty".