123621601 has 4 divisors (see below), whose sum is σ = 126636804. Its totient is φ = 120606400.

The previous prime is 123621571. The next prime is 123621629. The reversal of 123621601 is 106126321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 106126321 = 7 ⋅15160903.

It can be written as a sum of positive squares in 2 ways, for example, as 36012001 + 87609600 = 6001^2 + 9360^2 .

It is a cyclic number.

It is not a de Polignac number, because 123621601 - 2⁷ = 123621473 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123621691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1507540 + ... + 1507621.

It is an arithmetic number, because the mean of its divisors is an integer number (31659201).

Almost surely, 2^123621601 is an apocalyptic number.

It is an amenable number.

123621601 is a deficient number, since it is larger than the sum of its proper divisors (3015203).

123621601 is an equidigital number, since it uses as much as digits as its factorization.

123621601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3015202.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 123621601 is about 11118.5251270121. The cubic root of 123621601 is about 498.1553374763.

Adding to 123621601 its reverse (106126321), we get a palindrome (229747922).

The spelling of 123621601 in words is "one hundred twenty-three million, six hundred twenty-one thousand, six hundred one".