1620331051 has 4 divisors (see below), whose sum is σ = 1620421632. Its totient is φ = 1620240472.

The previous prime is 1620331049. The next prime is 1620331061. The reversal of 1620331051 is 1501330261.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1501330261 = 29 ⋅51770009.

It is a cyclic number.

It is not a de Polignac number, because 1620331051 - 2¹ = 1620331049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620331021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8491 + ... + 57556.

It is an arithmetic number, because the mean of its divisors is an integer number (405105408).

Almost surely, 2^1620331051 is an apocalyptic number.

1620331051 is a deficient number, since it is larger than the sum of its proper divisors (90581).

1620331051 is an equidigital number, since it uses as much as digits as its factorization.

1620331051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90580.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 1620331051 is about 40253.3358990283. The cubic root of 1620331051 is about 1174.5402881887.

The spelling of 1620331051 in words is "one billion, six hundred twenty million, three hundred thirty-one thousand, fifty-one".