1621253 has 4 divisors (see below), whose sum is σ = 1629600. Its totient is φ = 1612908.

The previous prime is 1621241. The next prime is 1621259. The reversal of 1621253 is 3521261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1621253 - 2⁴ = 1621237 is a prime.

It is a super-2 number, since 2×1621253² = 5256922580018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621259) 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, 3875 + ... + 4272.

It is an arithmetic number, because the mean of its divisors is an integer number (407400).

2^1621253 is an apocalyptic number.

It is an amenable number.

1621253 is a deficient number, since it is larger than the sum of its proper divisors (8347).

1621253 is an equidigital number, since it uses as much as digits as its factorization.

1621253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8346.

The product of its digits is 360, while the sum is 20.

The square root of 1621253 is about 1273.2843358810. The cubic root of 1621253 is about 117.4763012413.

The spelling of 1621253 in words is "one million, six hundred twenty-one thousand, two hundred fifty-three".