1621271 has 4 divisors (see below), whose sum is σ = 1625544. Its totient is φ = 1617000.

The previous prime is 1621259. The next prime is 1621283. The reversal of 1621271 is 1721261.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1621259) and next prime (1621283).

It is a cyclic number.

It is not a de Polignac number, because 1621271 - 2¹⁰ = 1620247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1505 + ... + 2346.

It is an arithmetic number, because the mean of its divisors is an integer number (406386).

2^1621271 is an apocalyptic number.

1621271 is a deficient number, since it is larger than the sum of its proper divisors (4273).

1621271 is an equidigital number, since it uses as much as digits as its factorization.

1621271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4272.

The product of its digits is 168, while the sum is 20.

The square root of 1621271 is about 1273.2914041962. The cubic root of 1621271 is about 117.4767360008.

The spelling of 1621271 in words is "one million, six hundred twenty-one thousand, two hundred seventy-one".