1620403101 has 12 divisors (see below), whose sum is σ = 2421292380. Its totient is φ = 1043017920.

The previous prime is 1620403097. The next prime is 1620403121. The reversal of 1620403101 is 1013040261.

It is a happy number.

1620403101 is a `hidden beast` number, since 1 + 620 + 40 + 3 + 1 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 870191001 + 750212100 = 29499^2 + 27390^2 .

It is not a de Polignac number, because 1620403101 - 2² = 1620403097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620403121) 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, 3103960 + ... + 3104481.

It is an arithmetic number, because the mean of its divisors is an integer number (201774365).

Almost surely, 2^1620403101 is an apocalyptic number.

It is an amenable number.

1620403101 is a deficient number, since it is larger than the sum of its proper divisors (800889279).

1620403101 is a wasteful number, since it uses less digits than its factorization.

1620403101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6208476 (or 6208473 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1620403101 is about 40254.2308459620. The cubic root of 1620403101 is about 1174.5576970537.

Adding to 1620403101 its reverse (1013040261), we get a palindrome (2633443362).

The spelling of 1620403101 in words is "one billion, six hundred twenty million, four hundred three thousand, one hundred one".