1621752106 has 64 divisors (see below), whose sum is σ = 2868969600. Its totient is φ = 680990976.

The previous prime is 1621752101. The next prime is 1621752127. The reversal of 1621752106 is 6012571261.

It is not an unprimeable number, because it can be changed into a prime (1621752101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1516540 + ... + 1517608.

It is an arithmetic number, because the mean of its divisors is an integer number (44827650).

Almost surely, 2^1621752106 is an apocalyptic number.

1621752106 is a deficient number, since it is larger than the sum of its proper divisors (1247217494).

1621752106 is a wasteful number, since it uses less digits than its factorization.

1621752106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1223.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 1621752106 is about 40270.9834247936. The cubic root of 1621752106 is about 1174.8835510974.

The spelling of 1621752106 in words is "one billion, six hundred twenty-one million, seven hundred fifty-two thousand, one hundred six".