3215620161 has 32 divisors (see below), whose sum is σ = 5269013120. Its totient is φ = 1925353152.

The previous prime is 3215620141. The next prime is 3215620169. The reversal of 3215620161 is 1610265123.

3215620161 is a `hidden beast` number, since 3 + 21 + 5 + 620 + 16 + 1 = 666.

It is not a de Polignac number, because 3215620161 - 2⁵ = 3215620129 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3215620169) by changing a digit.

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, 110815 + ... + 136788.

It is an arithmetic number, because the mean of its divisors is an integer number (164656660).

Almost surely, 2^3215620161 is an apocalyptic number.

It is an amenable number.

3215620161 is a deficient number, since it is larger than the sum of its proper divisors (2053392959).

3215620161 is a wasteful number, since it uses less digits than its factorization.

3215620161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247662 (or 247656 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 3215620161 is about 56706.4384439721. The cubic root of 3215620161 is about 1476.0064238930.

Adding to 3215620161 its reverse (1610265123), we get a palindrome (4825885284).

The spelling of 3215620161 in words is "three billion, two hundred fifteen million, six hundred twenty thousand, one hundred sixty-one".