1534420621 has 4 divisors (see below), whose sum is σ = 1534579132. Its totient is φ = 1534262112.

The previous prime is 1534420619. The next prime is 1534420627. The reversal of 1534420621 is 1260244351.

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 848556900 + 685863721 = 29130^2 + 26189^2 .

It is a cyclic number.

It is not a de Polignac number, because 1534420621 - 2¹ = 1534420619 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1534420621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1534420627) 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, 63720 + ... + 84433.

It is an arithmetic number, because the mean of its divisors is an integer number (383644783).

Almost surely, 2^1534420621 is an apocalyptic number.

It is an amenable number.

1534420621 is a deficient number, since it is larger than the sum of its proper divisors (158511).

1534420621 is a wasteful number, since it uses less digits than its factorization.

1534420621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158510.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 1534420621 is about 39171.6813654967. The cubic root of 1534420621 is about 1153.4040590480.

Adding to 1534420621 its reverse (1260244351), we get a palindrome (2794664972).

The spelling of 1534420621 in words is "one billion, five hundred thirty-four million, four hundred twenty thousand, six hundred twenty-one".