1444531621 has 8 divisors (see below), whose sum is σ = 1560623960. Its totient is φ = 1329149952.

The previous prime is 1444531577. The next prime is 1444531657. The reversal of 1444531621 is 1261354441.

It can be written as a sum of positive squares in 4 ways, for example, as 215678596 + 1228853025 = 14686^2 + 35055^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1444531621 - 2⁷ = 1444531493 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 (1444531681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 173436 + ... + 181573.

It is an arithmetic number, because the mean of its divisors is an integer number (195077995).

Almost surely, 2^1444531621 is an apocalyptic number.

It is an amenable number.

1444531621 is a deficient number, since it is larger than the sum of its proper divisors (116092339).

1444531621 is a wasteful number, since it uses less digits than its factorization.

1444531621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355335.

The product of its digits is 11520, while the sum is 31.

The square root of 1444531621 is about 38006.9943694578. The cubic root of 1444531621 is about 1130.4265549677.

The spelling of 1444531621 in words is "one billion, four hundred forty-four million, five hundred thirty-one thousand, six hundred twenty-one".