124031561 has 4 divisors (see below), whose sum is σ = 124078032. Its totient is φ = 123985092.

The previous prime is 124031549. The next prime is 124031569. The reversal of 124031561 is 165130421.

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 124031561 - 2²² = 119837257 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is not an unprimeable number, because it can be changed into a prime (124031569) 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, 18971 + ... + 24656.

It is an arithmetic number, because the mean of its divisors is an integer number (31019508).

Almost surely, 2^124031561 is an apocalyptic number.

It is an amenable number.

124031561 is a deficient number, since it is larger than the sum of its proper divisors (46471).

124031561 is an equidigital number, since it uses as much as digits as its factorization.

124031561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46470.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 124031561 is about 11136.9457662323. The cubic root of 124031561 is about 498.7053989090.

Adding to 124031561 its reverse (165130421), we get a palindrome (289161982).

The spelling of 124031561 in words is "one hundred twenty-four million, thirty-one thousand, five hundred sixty-one".