1620152181 has 12 divisors (see below), whose sum is σ = 2390012352. Its totient is φ = 1057120296.

The previous prime is 1620152153. The next prime is 1620152201. The reversal of 1620152181 is 1812510261.

1620152181 is a `hidden beast` number, since 1 + 62 + 0 + 1 + 521 + 81 = 666.

It is not a de Polignac number, because 1620152181 - 2⁶ = 1620152117 is a prime.

It is a super-2 number, since 2×1620152181² = 5249786179198113522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620152111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1914651 + ... + 1915496.

It is an arithmetic number, because the mean of its divisors is an integer number (199167696).

Almost surely, 2^1620152181 is an apocalyptic number.

It is an amenable number.

1620152181 is a deficient number, since it is larger than the sum of its proper divisors (769860171).

1620152181 is a wasteful number, since it uses less digits than its factorization.

1620152181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830200 (or 3830197 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 27.

The square root of 1620152181 is about 40251.1140342724. The cubic root of 1620152181 is about 1174.4970670308.

The spelling of 1620152181 in words is "one billion, six hundred twenty million, one hundred fifty-two thousand, one hundred eighty-one".