1622651 has 4 divisors (see below), whose sum is σ = 1625400. Its totient is φ = 1619904.

The previous prime is 1622641. The next prime is 1622659. The reversal of 1622651 is 1562261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1562261 = 59 ⋅26479.

It is a cyclic number.

It is not a de Polignac number, because 1622651 - 2⁶ = 1622587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1622659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86 + ... + 1803.

It is an arithmetic number, because the mean of its divisors is an integer number (406350).

2^1622651 is an apocalyptic number.

1622651 is a deficient number, since it is larger than the sum of its proper divisors (2749).

1622651 is an equidigital number, since it uses as much as digits as its factorization.

1622651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748.

The product of its digits is 720, while the sum is 23.

The square root of 1622651 is about 1273.8331915914. The cubic root of 1622651 is about 117.5100579892.

The spelling of 1622651 in words is "one million, six hundred twenty-two thousand, six hundred fifty-one".