1620271 has 2 divisors, whose sum is σ = 1620272. Its totient is φ = 1620270.

The previous prime is 1620257. The next prime is 1620319. The reversal of 1620271 is 1720261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620271 - 2⁵ = 1620239 is a prime.

It is a super-2 number, since 2×1620271² = 5250556226882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810135 + 810136.

It is an arithmetic number, because the mean of its divisors is an integer number (810136).

2^1620271 is an apocalyptic number.

1620271 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620271 is an equidigital number, since it uses as much as digits as its factorization.

1620271 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 1620271 is about 1272.8986605382. The cubic root of 1620271 is about 117.4525778152.

It can be divided in two parts, 1620 and 271, that added together give a triangular number (1891 = T₆₁).

The spelling of 1620271 in words is "one million, six hundred twenty thousand, two hundred seventy-one".