1620016871 has 16 divisors (see below), whose sum is σ = 1798574976. Its totient is φ = 1446900000.

The previous prime is 1620016829. The next prime is 1620016877. The reversal of 1620016871 is 1786100261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1620016871 - 2¹⁸ = 1619754727 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620016877) 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 15 ways as a sum of consecutive naturals, for example, 139976 + ... + 151106.

It is an arithmetic number, because the mean of its divisors is an integer number (112410936).

Almost surely, 2^1620016871 is an apocalyptic number.

1620016871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1620016871 is a deficient number, since it is larger than the sum of its proper divisors (178558105).

1620016871 is a wasteful number, since it uses less digits than its factorization.

1620016871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11374.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1620016871 is about 40249.4331761331. The cubic root of 1620016871 is about 1174.4643693570.

The spelling of 1620016871 in words is "one billion, six hundred twenty million, sixteen thousand, eight hundred seventy-one".