1620302641 has 4 divisors (see below), whose sum is σ = 1630243312. Its totient is φ = 1610361972.

The previous prime is 1620302609. The next prime is 1620302659. The reversal of 1620302641 is 1462030261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1462030261 = 12041 ⋅121421.

It is a cyclic number.

It is not a de Polignac number, because 1620302641 - 2⁵ = 1620302609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620302681) 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, 4970091 + ... + 4970416.

It is an arithmetic number, because the mean of its divisors is an integer number (407560828).

Almost surely, 2^1620302641 is an apocalyptic number.

It is an amenable number.

1620302641 is a deficient number, since it is larger than the sum of its proper divisors (9940671).

1620302641 is an equidigital number, since it uses as much as digits as its factorization.

1620302641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9940670.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1620302641 is about 40252.9830074741. The cubic root of 1620302641 is about 1174.5334235658.

The spelling of 1620302641 in words is "one billion, six hundred twenty million, three hundred two thousand, six hundred forty-one".