1620135871 has 12 divisors (see below), whose sum is σ = 1731568800. Its totient is φ = 1515410208.

The previous prime is 1620135823. The next prime is 1620135901. The reversal of 1620135871 is 1785310261.

It is a happy number.

It is not a de Polignac number, because 1620135871 - 2⁷ = 1620135743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620135821) 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 11 ways as a sum of consecutive naturals, for example, 115 + ... + 56923.

It is an arithmetic number, because the mean of its divisors is an integer number (144297400).

Almost surely, 2^1620135871 is an apocalyptic number.

1620135871 is a deficient number, since it is larger than the sum of its proper divisors (111432929).

1620135871 is an equidigital number, since it uses as much as digits as its factorization.

1620135871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56926 (or 56907 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1620135871 is about 40250.9114306745. The cubic root of 1620135871 is about 1174.4931258143.

The spelling of 1620135871 in words is "one billion, six hundred twenty million, one hundred thirty-five thousand, eight hundred seventy-one".