1621354413 has 16 divisors (see below), whose sum is σ = 2615967360. Its totient is φ = 871988736.

The previous prime is 1621354409. The next prime is 1621354457. The reversal of 1621354413 is 3144531261.

It is not a de Polignac number, because 1621354413 - 2² = 1621354409 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621354463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2270448 + ... + 2271161.

It is an arithmetic number, because the mean of its divisors is an integer number (163497960).

Almost surely, 2^1621354413 is an apocalyptic number.

It is an amenable number.

1621354413 is a deficient number, since it is larger than the sum of its proper divisors (994612947).

1621354413 is a wasteful number, since it uses less digits than its factorization.

1621354413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4541636.

The product of its digits is 8640, while the sum is 30.

The square root of 1621354413 is about 40266.0454104944. The cubic root of 1621354413 is about 1174.7875065867.

Adding to 1621354413 its reverse (3144531261), we get a palindrome (4765885674).

The spelling of 1621354413 in words is "one billion, six hundred twenty-one million, three hundred fifty-four thousand, four hundred thirteen".