1621453530 has 16 divisors (see below), whose sum is σ = 3891488544. Its totient is φ = 432387600.

The previous prime is 1621453513. The next prime is 1621453541. The reversal of 1621453530 is 353541261.

It is a super-2 number, since 2×1621453530² = 5258223099898921800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 54048451 = 1621453530 / (1 + 6 + 2 + 1 + 4 + 5 + 3 + 5 + 3 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27024196 + ... + 27024255.

It is an arithmetic number, because the mean of its divisors is an integer number (243218034).

Almost surely, 2^1621453530 is an apocalyptic number.

1621453530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1621453530 is an abundant number, since it is smaller than the sum of its proper divisors (2270035014).

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

1621453530 is a wasteful number, since it uses less digits than its factorization.

1621453530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54048461.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 1621453530 is about 40267.2761681244. The cubic root of 1621453530 is about 1174.8114452229.

Adding to 1621453530 its reverse (353541261), we get a palindrome (1974994791).

The spelling of 1621453530 in words is "one billion, six hundred twenty-one million, four hundred fifty-three thousand, five hundred thirty".