124621561 has 4 divisors (see below), whose sum is σ = 125248000. Its totient is φ = 123995124.

The previous prime is 124621559. The next prime is 124621573. The reversal of 124621561 is 165126421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 124621561 - 2¹ = 124621559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124621501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 312921 + ... + 313318.

It is an arithmetic number, because the mean of its divisors is an integer number (31312000).

Almost surely, 2^124621561 is an apocalyptic number.

It is an amenable number.

124621561 is a deficient number, since it is larger than the sum of its proper divisors (626439).

124621561 is an equidigital number, since it uses as much as digits as its factorization.

124621561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 626438.

The product of its digits is 2880, while the sum is 28.

The square root of 124621561 is about 11163.4027518495. The cubic root of 124621561 is about 499.4949045957.

Adding to 124621561 its reverse (165126421), we get a palindrome (289747982).

The spelling of 124621561 in words is "one hundred twenty-four million, six hundred twenty-one thousand, five hundred sixty-one".