1621241606 has 4 divisors (see below), whose sum is σ = 2431862412. Its totient is φ = 810620802.

The previous prime is 1621241569. The next prime is 1621241621. The reversal of 1621241606 is 6061421261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6061421261 = 7 ⋅865917323.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405310400 + ... + 405310403.

It is an arithmetic number, because the mean of its divisors is an integer number (607965603).

Almost surely, 2^1621241606 is an apocalyptic number.

1621241606 is a deficient number, since it is larger than the sum of its proper divisors (810620806).

1621241606 is an equidigital number, since it uses as much as digits as its factorization.

1621241606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810620805.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1621241606 is about 40264.6446153446. The cubic root of 1621241606 is about 1174.7602603686.

Adding to 1621241606 its reverse (6061421261), we get a palindrome (7682662867).

The spelling of 1621241606 in words is "one billion, six hundred twenty-one million, two hundred forty-one thousand, six hundred six".