123621506 has 4 divisors (see below), whose sum is σ = 185432262. Its totient is φ = 61810752.

The previous prime is 123621497. The next prime is 123621523. The reversal of 123621506 is 605126321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 113955625 + 9665881 = 10675^2 + 3109^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30905375 + ... + 30905378.

Almost surely, 2^123621506 is an apocalyptic number.

123621506 is a deficient number, since it is larger than the sum of its proper divisors (61810756).

123621506 is an equidigital number, since it uses as much as digits as its factorization.

123621506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61810755.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 123621506 is about 11118.5208548619. The cubic root of 123621506 is about 498.1552098698.

Adding to 123621506 its reverse (605126321), we get a palindrome (728747827).

The spelling of 123621506 in words is "one hundred twenty-three million, six hundred twenty-one thousand, five hundred six".