1621910163 has 16 divisors (see below), whose sum is σ = 2214178560. Its totient is φ = 1055488224.

The previous prime is 1621910161. The next prime is 1621910197. The reversal of 1621910163 is 3610191261.

It is not a de Polignac number, because 1621910163 - 2¹ = 1621910161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1621910163.

It is not an unprimeable number, because it can be changed into a prime (1621910161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 309973 + ... + 315161.

It is an arithmetic number, because the mean of its divisors is an integer number (138386160).

Almost surely, 2^1621910163 is an apocalyptic number.

1621910163 is a deficient number, since it is larger than the sum of its proper divisors (592268397).

1621910163 is a wasteful number, since it uses less digits than its factorization.

1621910163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7658.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 1621910163 is about 40272.9457949130. The cubic root of 1621910163 is about 1174.9217181588.

The spelling of 1621910163 in words is "one billion, six hundred twenty-one million, nine hundred ten thousand, one hundred sixty-three".