1621606547 has 16 divisors (see below), whose sum is σ = 1877550720. Its totient is φ = 1396577160.

The previous prime is 1621606541. The next prime is 1621606579. The reversal of 1621606547 is 7456061261.

It is not a de Polignac number, because 1621606547 - 2⁴ = 1621606531 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 1621606547.

It is not an unprimeable number, because it can be changed into a prime (1621606541) 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 15 ways as a sum of consecutive naturals, for example, 6773 + ... + 57350.

It is an arithmetic number, because the mean of its divisors is an integer number (117346920).

Almost surely, 2^1621606547 is an apocalyptic number.

1621606547 is a deficient number, since it is larger than the sum of its proper divisors (255944173).

1621606547 is an equidigital number, since it uses as much as digits as its factorization.

1621606547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64175 (or 64153 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1621606547 is about 40269.1761400702. The cubic root of 1621606547 is about 1174.8483998165.

The spelling of 1621606547 in words is "one billion, six hundred twenty-one million, six hundred six thousand, five hundred forty-seven".