1020553155 has 32 divisors (see below), whose sum is σ = 1815892800. Its totient is φ = 543822336.

The previous prime is 1020553147. The next prime is 1020553189. The reversal of 1020553155 is 5513550201.

1020553155 is a `hidden beast` number, since 102 + 0 + 553 + 1 + 5 + 5 = 666.

It is not a de Polignac number, because 1020553155 - 2³ = 1020553147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

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 31 ways as a sum of consecutive naturals, for example, 198477 + ... + 203553.

It is an arithmetic number, because the mean of its divisors is an integer number (56746650).

Almost surely, 2^1020553155 is an apocalyptic number.

1020553155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1020553155 is a deficient number, since it is larger than the sum of its proper divisors (795339645).

1020553155 is a wasteful number, since it uses less digits than its factorization.

1020553155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6580 (or 6574 counting only the distinct ones).

The product of its (nonzero) digits is 3750, while the sum is 27.

The square root of 1020553155 is about 31946.0976490087. The cubic root of 1020553155 is about 1006.8046434684.

The spelling of 1020553155 in words is "one billion, twenty million, five hundred fifty-three thousand, one hundred fifty-five".