1442156621 has 4 divisors (see below), whose sum is σ = 1442509692. Its totient is φ = 1441803552.

The previous prime is 1442156543. The next prime is 1442156629. The reversal of 1442156621 is 1266512441.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1121245225 + 320911396 = 33485^2 + 17914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1442156621 - 2¹⁴ = 1442140237 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 (1442156629) 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, 170336 + ... + 178601.

It is an arithmetic number, because the mean of its divisors is an integer number (360627423).

Almost surely, 2^1442156621 is an apocalyptic number.

It is an amenable number.

1442156621 is a deficient number, since it is larger than the sum of its proper divisors (353071).

1442156621 is an equidigital number, since it uses as much as digits as its factorization.

1442156621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353070.

The product of its digits is 11520, while the sum is 32.

The square root of 1442156621 is about 37975.7372673659. The cubic root of 1442156621 is about 1129.8066918134.

The spelling of 1442156621 in words is "one billion, four hundred forty-two million, one hundred fifty-six thousand, six hundred twenty-one".