1620201623 has 2 divisors, whose sum is σ = 1620201624. Its totient is φ = 1620201622.

The previous prime is 1620201607. The next prime is 1620201647. The reversal of 1620201623 is 3261020261.

It is a weak prime.

It is an emirp because it is prime and its reverse (3261020261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1620201623 - 2⁴ = 1620201607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620201523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810100811 + 810100812.

It is an arithmetic number, because the mean of its divisors is an integer number (810100812).

Almost surely, 2^1620201623 is an apocalyptic number.

1620201623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620201623 is an equidigital number, since it uses as much as digits as its factorization.

1620201623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 1620201623 is about 40251.7281989233. The cubic root of 1620201623 is about 1174.5090142404.

Adding to 1620201623 its reverse (3261020261), we get a palindrome (4881221884).

The spelling of 1620201623 in words is "one billion, six hundred twenty million, two hundred one thousand, six hundred twenty-three".