1620253447 has 2 divisors, whose sum is σ = 1620253448. Its totient is φ = 1620253446.

The previous prime is 1620253399. The next prime is 1620253501. The reversal of 1620253447 is 7443520261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620253447 - 2⁷ = 1620253319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620253847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810126723 + 810126724.

It is an arithmetic number, because the mean of its divisors is an integer number (810126724).

Almost surely, 2^1620253447 is an apocalyptic number.

1620253447 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620253447 is an equidigital number, since it uses as much as digits as its factorization.

1620253447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 34.

The square root of 1620253447 is about 40252.3719425328. The cubic root of 1620253447 is about 1174.5215367778.

The spelling of 1620253447 in words is "one billion, six hundred twenty million, two hundred fifty-three thousand, four hundred forty-seven".