124691621 has 4 divisors (see below), whose sum is σ = 124720812. Its totient is φ = 124662432.

The previous prime is 124691599. The next prime is 124691659. The reversal of 124691621 is 126196421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18395521 + 106296100 = 4289^2 + 10310^2 .

It is a cyclic number.

It is not a de Polignac number, because 124691621 - 2⁶ = 124691557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (124691321) 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, 6800 + ... + 17193.

It is an arithmetic number, because the mean of its divisors is an integer number (31180203).

Almost surely, 2^124691621 is an apocalyptic number.

It is an amenable number.

124691621 is a deficient number, since it is larger than the sum of its proper divisors (29191).

124691621 is an equidigital number, since it uses as much as digits as its factorization.

124691621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29190.

The product of its digits is 5184, while the sum is 32.

The square root of 124691621 is about 11166.5402430654. The cubic root of 124691621 is about 499.5884894110.

The spelling of 124691621 in words is "one hundred twenty-four million, six hundred ninety-one thousand, six hundred twenty-one".