1621199447 has 16 divisors (see below), whose sum is σ = 1892352000. Its totient is φ = 1388320920.

The previous prime is 1621199429. The next prime is 1621199473. The reversal of 1621199447 is 7449911261.

It is not a de Polignac number, because 1621199447 - 2⁸ = 1621199191 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621199398 and 1621199407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621159447) 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, 722954 + ... + 725192.

It is an arithmetic number, because the mean of its divisors is an integer number (118272000).

Almost surely, 2^1621199447 is an apocalyptic number.

1621199447 is a deficient number, since it is larger than the sum of its proper divisors (271152553).

1621199447 is an equidigital number, since it uses as much as digits as its factorization.

1621199447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4371 (or 4357 counting only the distinct ones).

The product of its digits is 108864, while the sum is 44.

The square root of 1621199447 is about 40264.1210881350. The cubic root of 1621199447 is about 1174.7500774020.

The spelling of 1621199447 in words is "one billion, six hundred twenty-one million, one hundred ninety-nine thousand, four hundred forty-seven".