1620256471 has 2 divisors, whose sum is σ = 1620256472. Its totient is φ = 1620256470.

The previous prime is 1620256453. The next prime is 1620256487. The reversal of 1620256471 is 1746520261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1620256471 - 2⁷ = 1620256343 is a prime.

It is a super-3 number, since 3×1620256471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620256411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810128235 + 810128236.

It is an arithmetic number, because the mean of its divisors is an integer number (810128236).

Almost surely, 2^1620256471 is an apocalyptic number.

1620256471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620256471 is an equidigital number, since it uses as much as digits as its factorization.

1620256471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 1620256471 is about 40252.4095055190. The cubic root of 1620256471 is about 1174.5222674765.

The spelling of 1620256471 in words is "one billion, six hundred twenty million, two hundred fifty-six thousand, four hundred seventy-one".