1620254161 has 16 divisors (see below), whose sum is σ = 1682845200. Its totient is φ = 1558759680.

The previous prime is 1620254143. The next prime is 1620254197. The reversal of 1620254161 is 1614520261.

It can be written as a sum of positive squares in 8 ways, for example, as 12645136 + 1607609025 = 3556^2 + 40095^2 .

It is not a de Polignac number, because 1620254161 - 2⁷ = 1620254033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620254101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1526571 + ... + 1527631.

It is an arithmetic number, because the mean of its divisors is an integer number (105177825).

Almost surely, 2^1620254161 is an apocalyptic number.

It is an amenable number.

1620254161 is a deficient number, since it is larger than the sum of its proper divisors (62591039).

1620254161 is a wasteful number, since it uses less digits than its factorization.

1620254161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1524.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 1620254161 is about 40252.3808115744. The cubic root of 1620254161 is about 1174.5217093040.

The spelling of 1620254161 in words is "one billion, six hundred twenty million, two hundred fifty-four thousand, one hundred sixty-one".