1441651621 has 4 divisors (see below), whose sum is σ = 1488156544. Its totient is φ = 1395146700.

The previous prime is 1441651579. The next prime is 1441651667. The reversal of 1441651621 is 1261561441.

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 1441651621 - 2²¹ = 1439554469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 46504891 = 1441651621 / (1 + 4 + 4 + 1 + 6 + 5 + 1 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1441651681) 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, 23252415 + ... + 23252476.

It is an arithmetic number, because the mean of its divisors is an integer number (372039136).

Almost surely, 2^1441651621 is an apocalyptic number.

It is an amenable number.

1441651621 is a deficient number, since it is larger than the sum of its proper divisors (46504923).

1441651621 is an equidigital number, since it uses as much as digits as its factorization.

1441651621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46504922.

The product of its digits is 5760, while the sum is 31.

The square root of 1441651621 is about 37969.0877030249. The cubic root of 1441651621 is about 1129.6748016102.

The spelling of 1441651621 in words is "one billion, four hundred forty-one million, six hundred fifty-one thousand, six hundred twenty-one".