1620288013 has 2 divisors, whose sum is σ = 1620288014. Its totient is φ = 1620288012.

The previous prime is 1620287989. The next prime is 1620288017. The reversal of 1620288013 is 3108820261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1296216009 + 324072004 = 36003^2 + 18002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620288013 - 2²⁵ = 1586733581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620288017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810144006 + 810144007.

It is an arithmetic number, because the mean of its divisors is an integer number (810144007).

Almost surely, 2^1620288013 is an apocalyptic number.

It is an amenable number.

1620288013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620288013 is an equidigital number, since it uses as much as digits as its factorization.

1620288013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 1620288013 is about 40252.8013062445. The cubic root of 1620288013 is about 1174.5298890149.

The spelling of 1620288013 in words is "one billion, six hundred twenty million, two hundred eighty-eight thousand, thirteen".