1621242315 has 144 divisors (see below), whose sum is σ = 3724081920. Its totient is φ = 633738240.

The previous prime is 1621242307. The next prime is 1621242319. The reversal of 1621242315 is 5132421261.

1621242315 is a `hidden beast` number, since 1 + 621 + 2 + 4 + 2 + 31 + 5 = 666.

It is not a de Polignac number, because 1621242315 - 2³ = 1621242307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621242319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1000576 + ... + 1002194.

It is an arithmetic number, because the mean of its divisors is an integer number (25861680).

Almost surely, 2^1621242315 is an apocalyptic number.

1621242315 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1621242315 is an abundant number, since it is smaller than the sum of its proper divisors (2102839605).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1621242315 is a wasteful number, since it uses less digits than its factorization.

1621242315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1662 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 1621242315 is about 40264.6534195937. The cubic root of 1621242315 is about 1174.7604316169.

Adding to 1621242315 its reverse (5132421261), we get a palindrome (6753663576).

The spelling of 1621242315 in words is "one billion, six hundred twenty-one million, two hundred forty-two thousand, three hundred fifteen".